diff --git a/backend/routes/download.js b/backend/routes/download.js
index 9c9b42b..95bb2a5 100644
--- a/backend/routes/download.js
+++ b/backend/routes/download.js
@@ -583,4 +583,71 @@ router.get('/stream/:taskId', async (req, res) => {
   });
 });
 
+/**
+ * 清理历史记录
+ * POST /api/download/cleanup/history
+ */
+router.post('/cleanup/history', async (req, res) => {
+  try {
+    const { keepCount = 500 } = req.body;
+    
+    const downloadService = req.backend.getDownloadService();
+    const result = await downloadService.cleanupHistory(parseInt(keepCount));
+    
+    res.json({
+      success: true,
+      data: result
+    });
+  } catch (error) {
+    res.status(500).json({
+      success: false,
+      error: error.message
+    });
+  }
+});
+
+/**
+ * 清理已完成的任务
+ * POST /api/download/cleanup/tasks
+ */
+router.post('/cleanup/tasks', async (req, res) => {
+  try {
+    const { keepActive = true, keepCompleted = 100 } = req.body;
+    
+    const downloadService = req.backend.getDownloadService();
+    const result = await downloadService.cleanupTasks(keepActive, parseInt(keepCompleted));
+    
+    res.json({
+      success: true,
+      data: result
+    });
+  } catch (error) {
+    res.status(500).json({
+      success: false,
+      error: error.message
+    });
+  }
+});
+
+/**
+ * 获取系统统计信息
+ * GET /api/download/stats
+ */
+router.get('/stats', async (req, res) => {
+  try {
+    const downloadService = req.backend.getDownloadService();
+    const result = await downloadService.getSystemStats();
+    
+    res.json({
+      success: true,
+      data: result
+    });
+  } catch (error) {
+    res.status(500).json({
+      success: false,
+      error: error.message
+    });
+  }
+});
+
 module.exports = router; 
\ No newline at end of file
diff --git a/backend/services/download-executor.js b/backend/services/download-executor.js
index dd396e1..4bad620 100644
--- a/backend/services/download-executor.js
+++ b/backend/services/download-executor.js
@@ -1,15 +1,16 @@
-const fs = require('fs-extra');
 const path = require('path');
+const fs = require('fs-extra');
 
 /**
  * 下载执行器 - 负责具体的下载逻辑执行
  */
 class DownloadExecutor {
-  constructor(fileManager, taskManager, progressManager, historyManager) {
+  constructor(fileManager, taskManager, progressManager, historyManager, downloadService) {
     this.fileManager = fileManager;
     this.taskManager = taskManager;
     this.progressManager = progressManager;
     this.historyManager = historyManager;
+    this.downloadService = downloadService; // 添加下载服务引用
   }
 
   /**
@@ -17,38 +18,53 @@ class DownloadExecutor {
    */
   async executeArtworkDownload(task, images, size, artworkDir, artwork) {
     try {
-      // 检查哪些文件已经存在（断点续传）
-      const existingFiles = new Set();
-      if (await this.fileManager.directoryExists(artworkDir)) {
-        const files = await this.fileManager.listDirectory(artworkDir);
-        for (const file of files) {
-          if (/\.(jpg|jpeg|png|gif|webp)$/i.test(file)) {
-            existingFiles.add(file);
-          }
-        }
-      }
-
-      // 逐个下载图片，实时更新进度
       const results = [];
+
       for (let index = 0; index < images.length; index++) {
         if (task.status === 'cancelled') {
           break;
         }
 
-        const image = images[index];
-        const imageUrl = image[size] || image.original;
-        // 使用安全处理的标题创建文件名
-        const safeTitle = this.fileManager.createSafeDirectoryName(artwork.title || 'Untitled');
-        const fileName = `${safeTitle}_${artwork.id}_${index + 1}${this.fileManager.getFileExtension(imageUrl)}`;
+        // 从图片对象中获取指定尺寸的URL
+        const imageObj = images[index];
+        let imageUrl;
+        
+        // 根据size参数选择对应的URL
+        switch (size) {
+          case 'original':
+            imageUrl = imageObj.original;
+            break;
+          case 'large':
+            imageUrl = imageObj.large;
+            break;
+          case 'medium':
+            imageUrl = imageObj.medium;
+            break;
+          case 'square_medium':
+            imageUrl = imageObj.square_medium;
+            break;
+          default:
+            imageUrl = imageObj.original || imageObj.large || imageObj.medium;
+        }
+
+        // 确保imageUrl是字符串
+        if (typeof imageUrl !== 'string') {
+          console.error(`图片URL不是字符串:`, imageUrl);
+          task.failed_files++;
+          this.progressManager.notifyProgressUpdate(task.id, task);
+          results.push({ success: false, error: '图片URL格式错误' });
+          continue;
+        }
+
+        const fileName = `image_${index + 1}.${this.getFileExtension(imageUrl)}`;
         const filePath = path.join(artworkDir, fileName);
 
-        // 如果文件已存在，跳过下载
-        if (existingFiles.has(fileName)) {
+        // 检查文件是否已存在
+        if (await this.fileManager.fileExists(filePath)) {
           task.completed_files++;
           task.progress = Math.round((task.completed_files / task.total_files) * 100);
           await this.taskManager.saveTasks();
           this.progressManager.notifyProgressUpdate(task.id, task);
-          results.push({ success: true, file: fileName, skipped: true });
           continue;
         }
 
@@ -95,7 +111,7 @@ class DownloadExecutor {
         completed_files: task.completed_files,
         failed_files: task.failed_files,
         start_time: task.start_time,
-        end_time: task.end_time,
+        end_time: task.end_time instanceof Date ? task.end_time.toISOString() : task.end_time,
         status: task.status,
       };
 
@@ -118,23 +134,66 @@ class DownloadExecutor {
 
     try {
       const results = [];
+      const recentCompleted = []; // 最近完成的作品列表
 
       // 分批下载
-      for (let i = 0; i < task.filtered_ids.length; i += concurrent) {
+      for (let i = 0; i < artworkIds.length; i += concurrent) {
         if (task.status === 'cancelled') {
           break;
         }
 
-        const batch = task.filtered_ids.slice(i, i + concurrent);
+        const batch = artworkIds.slice(i, i + concurrent);
         const batchPromises = batch.map(async artworkId => {
           try {
-            // 这里需要调用主下载服务的方法，暂时返回模拟结果
-            task.completed++;
-            const result = { artwork_id: artworkId, success: true };
-            results.push(result);
-            return result;
+            // 使用专门的批量下载方法，避免创建重复任务
+            const downloadResult = await this.downloadService.downloadSingleArtworkForBatch(artworkId, {
+              size,
+              quality,
+              format,
+              skipExisting: true
+            });
+
+            if (downloadResult.success) {
+              // 检查是否跳过下载
+              if (downloadResult.skipped) {
+                // 跳过下载，不计入失败，但也不计入完成
+                const result = { artwork_id: artworkId, success: true, skipped: true };
+                results.push(result);
+                return result;
+              } else {
+                // 真正下载成功
+                task.completed_files++;
+                
+                // 添加到最近完成列表
+                const completedItem = {
+                  artwork_id: artworkId,
+                  artwork_title: downloadResult.artwork_title || `作品 ${artworkId}`,
+                  artist_name: downloadResult.artist_name || '未知作者'
+                };
+                
+                recentCompleted.unshift(completedItem);
+                // 只保留最近5个
+                if (recentCompleted.length > 5) {
+                  recentCompleted.pop();
+                }
+                
+                // 更新任务的recent_completed
+                task.recent_completed = [...recentCompleted];
+                
+                const result = { artwork_id: artworkId, success: true };
+                results.push(result);
+                return result;
+              }
+            } else {
+              // 下载失败
+              task.failed_files++;
+              const result = { artwork_id: artworkId, success: false, error: downloadResult.error };
+              results.push(result);
+              return result;
+            }
           } catch (error) {
-            task.failed++;
+            // 异常情况
+            task.failed_files++;
             const result = { artwork_id: artworkId, success: false, error: error.message };
             results.push(result);
             return result;
@@ -142,22 +201,38 @@ class DownloadExecutor {
         });
 
         await Promise.all(batchPromises);
-        task.progress = Math.round((task.completed / task.total) * 100);
+
+        // 更新进度并通知
+        task.progress = Math.round((task.completed_files / task.total_files) * 100);
         await this.taskManager.saveTasks();
         this.progressManager.notifyProgressUpdate(task.id, task);
 
         // 添加延迟避免请求过于频繁
-        if (i + concurrent < task.filtered_ids.length) {
+        if (i + concurrent < artworkIds.length) {
           await new Promise(resolve => setTimeout(resolve, 1000));
         }
       }
 
       // 更新任务状态
-      task.status = task.failed === 0 ? 'completed' : 'partial';
+      task.status = task.failed_files === 0 ? 'completed' : 'partial';
       task.end_time = new Date();
       task.results = results;
       await this.taskManager.saveTasks();
       this.progressManager.notifyProgressUpdate(task.id, task);
+      
+      // 添加到历史记录
+      const historyItem = {
+        id: task.id,
+        type: 'batch',
+        total_files: task.total_files,
+        completed_files: task.completed_files,
+        failed_files: task.failed_files,
+        start_time: task.start_time,
+        end_time: task.end_time instanceof Date ? task.end_time.toISOString() : task.end_time,
+        status: task.status,
+      };
+      
+      await this.historyManager.addHistoryItem(historyItem);
     } catch (error) {
       task.status = 'failed';
       task.error = error.message;
@@ -175,6 +250,7 @@ class DownloadExecutor {
 
     try {
       const results = [];
+      const recentCompleted = []; // 最近完成的作品列表
 
       // 分批下载作品
       for (let i = 0; i < newArtworks.length; i += maxConcurrent) {
@@ -185,13 +261,55 @@ class DownloadExecutor {
         const batch = newArtworks.slice(i, i + maxConcurrent);
         const batchPromises = batch.map(async artwork => {
           try {
-            // 这里需要调用主下载服务的方法，暂时返回模拟结果
-            task.completed++;
-            const result = { artwork_id: artwork.id, success: true };
-            results.push(result);
-            return result;
+            // 使用专门的批量下载方法，避免创建重复任务
+            const downloadResult = await this.downloadService.downloadSingleArtworkForBatch(artwork.id, {
+              size,
+              quality,
+              format,
+              skipExisting: true
+            });
+
+            if (downloadResult.success) {
+              // 检查是否跳过下载
+              if (downloadResult.skipped) {
+                // 跳过下载，不计入失败，但也不计入完成
+                const result = { artwork_id: artwork.id, success: true, skipped: true };
+                results.push(result);
+                return result;
+              } else {
+                // 真正下载成功
+                task.completed_files++;
+                
+                // 添加到最近完成列表
+                const completedItem = {
+                  artwork_id: artwork.id,
+                  artwork_title: downloadResult.artwork_title || artwork.title || `作品 ${artwork.id}`,
+                  artist_name: downloadResult.artist_name || artwork.user?.name || '未知作者'
+                };
+                
+                recentCompleted.unshift(completedItem);
+                // 只保留最近5个
+                if (recentCompleted.length > 5) {
+                  recentCompleted.pop();
+                }
+                
+                // 更新任务的recent_completed
+                task.recent_completed = [...recentCompleted];
+                
+                const result = { artwork_id: artwork.id, success: true };
+                results.push(result);
+                return result;
+              }
+            } else {
+              // 下载失败
+              task.failed_files++;
+              const result = { artwork_id: artwork.id, success: false, error: downloadResult.error };
+              results.push(result);
+              return result;
+            }
           } catch (error) {
-            task.failed++;
+            // 异常情况
+            task.failed_files++;
             const result = { artwork_id: artwork.id, success: false, error: error.message };
             results.push(result);
             return result;
@@ -199,7 +317,9 @@ class DownloadExecutor {
         });
 
         await Promise.all(batchPromises);
-        task.progress = Math.round((task.completed / task.total) * 100);
+
+        // 更新进度并通知
+        task.progress = Math.round((task.completed_files / task.total_files) * 100);
         await this.taskManager.saveTasks();
         this.progressManager.notifyProgressUpdate(task.id, task);
 
@@ -210,11 +330,26 @@ class DownloadExecutor {
       }
 
       // 更新任务状态
-      task.status = task.failed === 0 ? 'completed' : 'partial';
+      task.status = task.failed_files === 0 ? 'completed' : 'partial';
       task.end_time = new Date();
       task.results = results;
       await this.taskManager.saveTasks();
       this.progressManager.notifyProgressUpdate(task.id, task);
+      
+      // 添加到历史记录
+      const historyItem = {
+        id: task.id,
+        type: 'artist',
+        artist_name: task.artist_name,
+        total_files: task.total_files,
+        completed_files: task.completed_files,
+        failed_files: task.failed_files,
+        start_time: task.start_time,
+        end_time: task.end_time instanceof Date ? task.end_time.toISOString() : task.end_time,
+        status: task.status,
+      };
+      
+      await this.historyManager.addHistoryItem(historyItem);
     } catch (error) {
       task.status = 'failed';
       task.error = error.message;
@@ -232,6 +367,7 @@ class DownloadExecutor {
 
     try {
       const results = [];
+      const recentCompleted = []; // 最近完成的作品列表
 
       // 分批下载作品
       for (let i = 0; i < newArtworks.length; i += maxConcurrent) {
@@ -242,13 +378,55 @@ class DownloadExecutor {
         const batch = newArtworks.slice(i, i + maxConcurrent);
         const batchPromises = batch.map(async artwork => {
           try {
-            // 这里需要调用主下载服务的方法，暂时返回模拟结果
-            task.completed++;
-            const result = { artwork_id: artwork.id, success: true };
-            results.push(result);
-            return result;
+            // 使用专门的批量下载方法，避免创建重复任务
+            const downloadResult = await this.downloadService.downloadSingleArtworkForBatch(artwork.id, {
+              size,
+              quality,
+              format,
+              skipExisting: true
+            });
+
+            if (downloadResult.success) {
+              // 检查是否跳过下载
+              if (downloadResult.skipped) {
+                // 跳过下载，不计入失败，但也不计入完成
+                const result = { artwork_id: artwork.id, success: true, skipped: true };
+                results.push(result);
+                return result;
+              } else {
+                // 真正下载成功
+                task.completed_files++;
+                
+                // 添加到最近完成列表
+                const completedItem = {
+                  artwork_id: artwork.id,
+                  artwork_title: downloadResult.artwork_title || artwork.title || `作品 ${artwork.id}`,
+                  artist_name: downloadResult.artist_name || artwork.user?.name || '未知作者'
+                };
+                
+                recentCompleted.unshift(completedItem);
+                // 只保留最近5个
+                if (recentCompleted.length > 5) {
+                  recentCompleted.pop();
+                }
+                
+                // 更新任务的recent_completed
+                task.recent_completed = [...recentCompleted];
+                
+                const result = { artwork_id: artwork.id, success: true };
+                results.push(result);
+                return result;
+              }
+            } else {
+              // 下载失败
+              task.failed_files++;
+              const result = { artwork_id: artwork.id, success: false, error: downloadResult.error };
+              results.push(result);
+              return result;
+            }
           } catch (error) {
-            task.failed++;
+            // 异常情况
+            task.failed_files++;
             const result = { artwork_id: artwork.id, success: false, error: error.message };
             results.push(result);
             return result;
@@ -256,7 +434,9 @@ class DownloadExecutor {
         });
 
         await Promise.all(batchPromises);
-        task.progress = Math.round((task.completed / task.total) * 100);
+
+        // 更新进度并通知
+        task.progress = Math.round((task.completed_files / task.total_files) * 100);
         await this.taskManager.saveTasks();
         this.progressManager.notifyProgressUpdate(task.id, task);
 
@@ -267,11 +447,25 @@ class DownloadExecutor {
       }
 
       // 更新任务状态
-      task.status = task.failed === 0 ? 'completed' : 'partial';
+      task.status = task.failed_files === 0 ? 'completed' : 'partial';
       task.end_time = new Date();
       task.results = results;
       await this.taskManager.saveTasks();
       this.progressManager.notifyProgressUpdate(task.id, task);
+      
+      // 添加到历史记录
+      const historyItem = {
+        id: task.id,
+        type: 'ranking',
+        total_files: task.total_files,
+        completed_files: task.completed_files,
+        failed_files: task.failed_files,
+        start_time: task.start_time,
+        end_time: task.end_time instanceof Date ? task.end_time.toISOString() : task.end_time,
+        status: task.status,
+      };
+      
+      await this.historyManager.addHistoryItem(historyItem);
     } catch (error) {
       task.status = 'failed';
       task.error = error.message;
@@ -280,6 +474,19 @@ class DownloadExecutor {
       this.progressManager.notifyProgressUpdate(task.id, task);
     }
   }
+
+  /**
+   * 获取文件扩展名
+   */
+  getFileExtension(url) {
+    if (typeof url !== 'string') {
+      console.warn('URL不是字符串，使用默认扩展名:', url);
+      return 'jpg';
+    }
+    
+    const match = url.match(/\.([a-zA-Z0-9]+)(?:\?|$)/);
+    return match ? match[1] : 'jpg';
+  }
 }
 
 module.exports = DownloadExecutor;
diff --git a/backend/services/download.js b/backend/services/download.js
index ec1d23b..b5bbcff 100644
--- a/backend/services/download.js
+++ b/backend/services/download.js
@@ -6,6 +6,7 @@ const FileManager = require('./file-manager');
 const ProgressManager = require('./progress-manager');
 const HistoryManager = require('./history-manager');
 const DownloadExecutor = require('./download-executor');
+const fs = require('fs-extra'); // Added for fs-extra
 
 /**
  * 下载服务 - 主服务类，协调各个管理器
@@ -32,7 +33,8 @@ class DownloadService {
     this.taskManager = new TaskManager(this.dataPath);
     this.progressManager = new ProgressManager();
     this.historyManager = new HistoryManager(this.dataPath);
-    this.downloadExecutor = new DownloadExecutor(this.fileManager, this.taskManager, this.progressManager, this.historyManager);
+    // 先创建下载执行器，稍后在init方法中设置downloadService引用
+    this.downloadExecutor = new DownloadExecutor(this.fileManager, this.taskManager, this.progressManager, this.historyManager, this);
 
     this.initialized = false;
   }
@@ -148,6 +150,63 @@ class DownloadService {
     };
   }
 
+  /**
+   * 清理历史记录
+   */
+  async cleanupHistory(keepCount = 500) {
+    try {
+      const result = await this.historyManager.cleanupHistoryManually(keepCount);
+      return {
+        success: true,
+        data: result
+      };
+    } catch (error) {
+      return {
+        success: false,
+        error: error.message
+      };
+    }
+  }
+
+  /**
+   * 清理已完成的任务
+   */
+  async cleanupTasks(keepActive = true, keepCompleted = 100) {
+    try {
+      const result = await this.taskManager.cleanupTasksManually(keepActive, keepCompleted);
+      return {
+        success: true,
+        data: { cleaned: result }
+      };
+    } catch (error) {
+      return {
+        success: false,
+        error: error.message
+      };
+    }
+  }
+
+  /**
+   * 获取系统统计信息
+   */
+  async getSystemStats() {
+    try {
+      const taskStats = this.taskManager.getTaskStats();
+      const historyStats = this.historyManager.getHistoryStats();
+      
+      return {
+        tasks: taskStats,
+        history: historyStats,
+        activeConnections: this.progressManager.getTotalListenerCount()
+      };
+    } catch (error) {
+      return {
+        success: false,
+        error: error.message
+      };
+    }
+  }
+
   // 代理方法 - 文件管理
   async getDownloadedFiles() {
     try {
@@ -409,9 +468,9 @@ class DownloadService {
       const task = this.taskManager.createTask('batch', {
         artwork_ids: artworkIds,
         filtered_ids: filteredIds,
-        total: filteredIds.length,
-        completed: 0,
-        failed: 0,
+        total_files: filteredIds.length,
+        completed_files: 0,
+        failed_files: 0,
         skipped: skippedCount,
         results: [],
       });
@@ -439,7 +498,7 @@ class DownloadService {
       }
 
       // 异步执行批量下载
-      this.downloadExecutor.executeBatchDownload(task, artworkIds, options);
+      this.downloadExecutor.executeBatchDownload(task, filteredIds, options);
 
       return {
         success: true,
@@ -460,6 +519,153 @@ class DownloadService {
     }
   }
 
+  /**
+   * 内部方法：下载单个作品（用于批量下载，不创建新任务）
+   */
+  async downloadSingleArtworkForBatch(artworkId, options = {}) {
+    const { size = 'original', quality = 'high', format = 'auto', skipExisting = true } = options;
+
+    try {
+      // 检查是否已下载
+      if (skipExisting && (await this.isArtworkDownloaded(artworkId))) {
+        return {
+          success: true,
+          skipped: true,
+          message: '作品已存在且完整，跳过下载',
+        };
+      }
+
+      // 获取作品信息
+      const artworkResult = await this.artworkService.getArtworkDetail(artworkId);
+      if (!artworkResult.success) {
+        throw new Error(`获取作品信息失败: ${artworkResult.error}`);
+      }
+
+      const artwork = artworkResult.data;
+
+      // 确保作品信息完整
+      if (!artwork || !artwork.user || !artwork.title) {
+        throw new Error('作品信息不完整');
+      }
+
+      const artistName = this.fileManager.createSafeDirectoryName(artwork.user.name || 'Unknown Artist');
+      const artworkTitle = this.fileManager.createSafeDirectoryName(artwork.title || 'Untitled');
+
+      // 创建作品目录
+      const downloadPath = await this.fileManager.getDownloadPath();
+      const artistDir = path.join(downloadPath, artistName);
+      const artworkDirName = `${artworkId}_${artworkTitle}`;
+      const artworkDir = path.join(artistDir, artworkDirName);
+
+      // 如果是重新下载，先删除现有目录
+      if (!skipExisting && (await this.fileManager.directoryExists(artworkDir))) {
+        console.log(`删除现有作品目录: ${artworkDir}`);
+        await this.fileManager.removeDirectory(artworkDir);
+      }
+
+      await this.fileManager.ensureDirectory(artworkDir);
+
+      // 获取图片URL
+      const imagesResult = await this.artworkService.getArtworkImages(artworkId, size);
+      if (!imagesResult.success) {
+        throw new Error(`获取图片URL失败: ${imagesResult.error}`);
+      }
+
+      const images = imagesResult.data.images;
+
+      // 直接下载，不创建新任务
+      const results = [];
+      for (let index = 0; index < images.length; index++) {
+        // 从图片对象中获取指定尺寸的URL
+        const imageObj = images[index];
+        let imageUrl;
+        
+        // 根据size参数选择对应的URL
+        switch (size) {
+          case 'original':
+            imageUrl = imageObj.original;
+            break;
+          case 'large':
+            imageUrl = imageObj.large;
+            break;
+          case 'medium':
+            imageUrl = imageObj.medium;
+            break;
+          case 'square_medium':
+            imageUrl = imageObj.square_medium;
+            break;
+          default:
+            imageUrl = imageObj.original || imageObj.large || imageObj.medium;
+        }
+
+        // 确保imageUrl是字符串
+        if (typeof imageUrl !== 'string') {
+          console.error(`图片URL不是字符串:`, imageUrl);
+          results.push({ success: false, error: '图片URL格式错误' });
+          continue;
+        }
+
+        const fileName = `image_${index + 1}.${this.getFileExtension(imageUrl)}`;
+        const filePath = path.join(artworkDir, fileName);
+
+        // 检查文件是否已存在
+        if (await this.fileManager.fileExists(filePath)) {
+          results.push({ success: true, file: fileName, skipped: true });
+          continue;
+        }
+
+        try {
+          // 确保目录存在
+          await this.fileManager.ensureDirectory(path.dirname(filePath));
+          await this.fileManager.downloadFile(imageUrl, filePath);
+          results.push({ success: true, file: fileName });
+        } catch (error) {
+          console.error(`下载图片失败 ${index + 1}: ${error.message}`);
+          results.push({ success: false, error: error.message });
+        }
+      }
+
+      // 保存作品信息
+      const infoPath = path.join(artworkDir, 'artwork_info.json');
+      await fs.writeJson(infoPath, artwork, { spaces: 2 });
+
+      // 检查下载结果
+      const failedCount = results.filter(r => !r.success).length;
+      const successCount = results.filter(r => r.success && !r.skipped).length;
+
+      return {
+        success: failedCount === 0,
+        artwork_id: artworkId,
+        artist_name: artistName,
+        artwork_title: artworkTitle,
+        total_files: images.length,
+        completed_files: successCount,
+        failed_files: failedCount,
+        results: results,
+      };
+    } catch (error) {
+      console.error(`下载作品 ${artworkId} 失败:`, error);
+      return {
+        success: false,
+        error: error.message,
+        artwork_id: artworkId,
+      };
+    }
+  }
+
+  /**
+   * 获取文件扩展名
+   */
+  getFileExtension(url) {
+    if (typeof url !== 'string') {
+      console.warn('URL不是字符串，使用默认扩展名:', url);
+      return 'jpg';
+    }
+    
+    const match = url.match(/\.([a-zA-Z0-9]+)(?:\?|$)/);
+    return match ? match[1] : 'jpg';
+  }
+
   /**
    * 下载作者作品
    */
@@ -467,12 +673,24 @@ class DownloadService {
     const { type = 'art', limit = 50, size = 'original', quality = 'high', format = 'auto', skipExisting = true, maxConcurrent = 3, pageSize = 30 } = options;
 
     try {
+      // 先获取作者信息
+      let artistName = '未知作者';
+      try {
+        const artistResult = await this.artistService.getArtistInfo(artistId);
+        if (artistResult.success && artistResult.data) {
+          artistName = artistResult.data.name || `作者 ${artistId}`;
+        }
+      } catch (err) {
+        console.warn(`获取作者 ${artistId} 信息失败:`, err.message);
+      }
+
       // 创建任务记录
       const task = this.taskManager.createTask('artist', {
         artist_id: artistId,
-        total: 0,
-        completed: 0,
-        failed: 0,
+        artist_name: artistName,
+        total_files: 0,
+        completed_files: 0,
+        failed_files: 0,
         skipped: 0,
         results: [],
       });
@@ -521,7 +739,7 @@ class DownloadService {
 
       await this.taskManager.updateTask(task.id, {
         skipped: skippedCount,
-        total: newArtworks.length,
+        total_files: newArtworks.length,
       });
 
       // 作者作品下载统计
@@ -538,6 +756,7 @@ class DownloadService {
           data: {
             task_id: task.id,
             artist_id: artistId,
+            artist_name: artistName,
             total_artworks: allArtworks.length,
             completed_artworks: 0,
             failed_artworks: 0,
@@ -555,9 +774,10 @@ class DownloadService {
         data: {
           task_id: task.id,
           artist_id: artistId,
-          total_artworks: task.total,
-          completed_artworks: task.completed,
-          failed_artworks: task.failed,
+          artist_name: artistName,
+          total_artworks: task.total_files,
+          completed_artworks: task.completed_files,
+          failed_artworks: task.failed_files,
           message: '作者作品下载任务已创建，正在后台执行',
         },
       };
@@ -581,9 +801,9 @@ class DownloadService {
       const task = this.taskManager.createTask('ranking', {
         mode: mode,
         type: type,
-        total: 0,
-        completed: 0,
-        failed: 0,
+        total_files: 0,
+        completed_files: 0,
+        failed_files: 0,
         skipped: 0,
         results: [],
       });
@@ -631,7 +851,7 @@ class DownloadService {
 
       await this.taskManager.updateTask(task.id, {
         skipped: skippedCount,
-        total: newArtworks.length,
+        total_files: newArtworks.length,
       });
 
       // 排行榜作品下载统计
diff --git a/backend/services/history-manager.js b/backend/services/history-manager.js
index b767ef7..7a37875 100644
--- a/backend/services/history-manager.js
+++ b/backend/services/history-manager.js
@@ -10,6 +10,10 @@ class HistoryManager {
     this.historyFile = path.join(dataPath, 'download_history.json');
     this.history = [];
     this.initialized = false;
+    
+    // 配置
+    this.maxHistoryItems = 500; // 最多保存500条历史记录
+    this.cleanupThreshold = 600; // 超过600条时开始清理
   }
 
   /**
@@ -19,8 +23,12 @@ class HistoryManager {
     try {
       await fs.ensureDir(this.dataPath);
       await this.loadHistory();
+      
+      // 初始化时清理历史记录
+      await this.cleanupHistory();
+      
       this.initialized = true;
-      // 历史记录管理器初始化完成
+      console.log('历史记录管理器初始化完成');
     } catch (error) {
       console.error('历史记录管理器初始化失败:', error);
       this.initialized = false;
@@ -53,10 +61,47 @@ class HistoryManager {
   }
 
   /**
-   * 添加历史记录
+   * 添加历史记录（简化版本）
    */
   async addHistoryItem(item) {
-    this.history.unshift(item);
+    // 简化历史记录信息
+    const simplifiedItem = {
+      id: item.id,
+      type: item.type,
+      status: item.status,
+      total_files: item.total_files,
+      completed_files: item.completed_files,
+      failed_files: item.failed_files,
+      start_time: item.start_time,
+      end_time: item.end_time,
+      // 只保存关键信息
+      artwork_id: item.artwork_id,
+      artist_name: item.artist_name,
+      artwork_title: item.artwork_title
+    };
+
+    this.history.unshift(simplifiedItem);
+    
+    // 检查是否需要清理
+    if (this.history.length > this.cleanupThreshold) {
+      await this.cleanupHistory();
+    } else {
+      await this.saveHistory();
+    }
+  }
+
+  /**
+   * 清理历史记录
+   */
+  async cleanupHistory() {
+    if (this.history.length <= this.maxHistoryItems) {
+      return;
+    }
+
+    console.log(`清理历史记录: ${this.history.length} -> ${this.maxHistoryItems}`);
+    
+    // 保留最新的记录
+    this.history = this.history.slice(0, this.maxHistoryItems);
     await this.saveHistory();
   }
 
@@ -120,8 +165,7 @@ class HistoryManager {
       completed: 0,
       failed: 0,
       partial: 0,
-      totalFiles: 0,
-      totalSize: 0
+      totalFiles: 0
     };
 
     for (const item of this.history) {
@@ -153,6 +197,21 @@ class HistoryManager {
       (item.artist_name && item.artist_name.toLowerCase().includes(lowerQuery))
     );
   }
+
+  /**
+   * 手动清理历史记录（保留指定数量）
+   */
+  async cleanupHistoryManually(keepCount = this.maxHistoryItems) {
+    if (this.history.length <= keepCount) {
+      return { cleaned: 0, remaining: this.history.length };
+    }
+
+    const cleanedCount = this.history.length - keepCount;
+    this.history = this.history.slice(0, keepCount);
+    await this.saveHistory();
+
+    return { cleaned: cleanedCount, remaining: this.history.length };
+  }
 }
 
 module.exports = HistoryManager; 
\ No newline at end of file
diff --git a/backend/services/progress-manager.js b/backend/services/progress-manager.js
index 513efca..e2ad1b8 100644
--- a/backend/services/progress-manager.js
+++ b/backend/services/progress-manager.js
@@ -58,6 +58,17 @@ class ProgressManager {
       : 0;
   }
 
+  /**
+   * 获取总连接数
+   */
+  getTotalListenerCount() {
+    let total = 0;
+    for (const listeners of this.progressListeners.values()) {
+      total += listeners.length;
+    }
+    return total;
+  }
+
   /**
    * 清理所有监听器
    */
diff --git a/backend/services/task-manager.js b/backend/services/task-manager.js
index 11b1b4a..0d8442f 100644
--- a/backend/services/task-manager.js
+++ b/backend/services/task-manager.js
@@ -11,6 +11,10 @@ class TaskManager {
     this.tasksFile = path.join(dataPath, 'download_tasks.json');
     this.tasks = new Map(); // 内存中的任务状态
     this.initialized = false;
+    
+    // 配置
+    this.maxCompletedTasks = 100; // 最多保留100个已完成的任务
+    this.cleanupThreshold = 150; // 超过150个时开始清理
   }
 
   /**
@@ -20,8 +24,12 @@ class TaskManager {
     try {
       await fs.ensureDir(this.dataPath);
       await this.loadTasks();
+      
+      // 初始化时清理已完成的任务
+      await this.cleanupCompletedTasks();
+      
       this.initialized = true;
-      // 任务管理器初始化完成
+      console.log('任务管理器初始化完成');
     } catch (error) {
       console.error('任务管理器初始化失败:', error);
       this.initialized = false;
@@ -99,7 +107,14 @@ class TaskManager {
     }
 
     Object.assign(task, updates);
-    await this.saveTasks();
+    
+    // 如果任务完成，检查是否需要清理
+    if (['completed', 'failed', 'cancelled', 'partial'].includes(updates.status)) {
+      await this.checkAndCleanupTasks();
+    } else {
+      await this.saveTasks();
+    }
+    
     return true;
   }
 
@@ -121,6 +136,24 @@ class TaskManager {
     return Array.from(this.tasks.values());
   }
 
+  /**
+   * 获取活跃任务（下载中或暂停）
+   */
+  getActiveTasks() {
+    return Array.from(this.tasks.values()).filter(task => 
+      ['downloading', 'paused'].includes(task.status)
+    );
+  }
+
+  /**
+   * 获取已完成的任务
+   */
+  getCompletedTasks() {
+    return Array.from(this.tasks.values()).filter(task => 
+      ['completed', 'failed', 'cancelled', 'partial'].includes(task.status)
+    );
+  }
+
   /**
    * 获取指定状态的任务
    */
@@ -128,23 +161,45 @@ class TaskManager {
     return Array.from(this.tasks.values()).filter(task => task.status === status);
   }
 
+  /**
+   * 检查并清理任务
+   */
+  async checkAndCleanupTasks() {
+    const completedTasks = this.getCompletedTasks();
+    
+    if (completedTasks.length > this.cleanupThreshold) {
+      await this.cleanupCompletedTasks();
+    } else {
+      await this.saveTasks();
+    }
+  }
+
   /**
    * 清理已完成的任务
    */
   async cleanupCompletedTasks() {
     const completedStatuses = ['completed', 'failed', 'cancelled', 'partial'];
+    const completedTasks = Array.from(this.tasks.entries())
+      .filter(([_, task]) => completedStatuses.includes(task.status))
+      .sort((a, b) => new Date(b[1].end_time) - new Date(a[1].end_time)); // 按完成时间排序
+
+    if (completedTasks.length <= this.maxCompletedTasks) {
+      await this.saveTasks();
+      return 0;
+    }
+
+    // 删除超出限制的已完成任务
+    const tasksToDelete = completedTasks.slice(this.maxCompletedTasks);
     let cleanedCount = 0;
 
-    for (const [taskId, task] of this.tasks) {
-      if (completedStatuses.includes(task.status)) {
-        this.tasks.delete(taskId);
-        cleanedCount++;
-      }
+    for (const [taskId, _] of tasksToDelete) {
+      this.tasks.delete(taskId);
+      cleanedCount++;
     }
 
     if (cleanedCount > 0) {
       await this.saveTasks();
-      // 清理了已完成的任务
+      console.log(`清理已完成任务: ${cleanedCount} 个`);
     }
 
     return cleanedCount;
@@ -172,6 +227,43 @@ class TaskManager {
 
     return stats;
   }
+
+  /**
+   * 手动清理任务
+   */
+  async cleanupTasksManually(keepActive = true, keepCompleted = this.maxCompletedTasks) {
+    let cleanedCount = 0;
+    
+    if (keepActive) {
+      // 保留活跃任务
+      const activeTasks = this.getActiveTasks();
+      const completedTasks = this.getCompletedTasks()
+        .sort((a, b) => new Date(b.end_time) - new Date(a.end_time))
+        .slice(0, keepCompleted);
+      
+      // 重建任务Map
+      const newTasks = new Map();
+      
+      // 添加活跃任务
+      for (const task of activeTasks) {
+        newTasks.set(task.id, task);
+      }
+      
+      // 添加要保留的已完成任务
+      for (const task of completedTasks) {
+        newTasks.set(task.id, task);
+      }
+      
+      cleanedCount = this.tasks.size - newTasks.size;
+      this.tasks = newTasks;
+    } else {
+      // 清理所有已完成任务
+      cleanedCount = await this.cleanupCompletedTasks();
+    }
+    
+    await this.saveTasks();
+    return cleanedCount;
+  }
 }
 
 module.exports = TaskManager;
diff --git a/ui/src/components/download/DownloadProgress.vue b/ui/src/components/download/DownloadProgress.vue
index d5f8046..5321445 100644
--- a/ui/src/components/download/DownloadProgress.vue
+++ b/ui/src/components/download/DownloadProgress.vue
@@ -42,6 +42,36 @@
       </div>
     </div>
 
+    <!-- 批量下载的详细进度 -->
+    <div v-if="task.type === 'batch' || task.type === 'artist'" class="batch-progress">
+      <div class="batch-stats">
+        <div class="stat-item">
+          <span class="stat-label">已完成:</span>
+          <span class="stat-value success">{{ task.completed_files }}</span>
+        </div>
+        <div class="stat-item">
+          <span class="stat-label">失败:</span>
+          <span class="stat-value error">{{ task.failed_files }}</span>
+        </div>
+        <div class="stat-item">
+          <span class="stat-label">剩余:</span>
+          <span class="stat-value">{{ task.total_files - task.completed_files - task.failed_files }}</span>
+        </div>
+      </div>
+      
+      <!-- 最近完成的作品列表 -->
+      <div v-if="task.recent_completed && task.recent_completed.length > 0" class="recent-completed">
+        <h4>最近完成:</h4>
+        <div class="completed-list">
+          <div v-for="item in task.recent_completed.slice(0, 3)" :key="item.artwork_id" class="completed-item">
+            <span class="artwork-id">#{{ item.artwork_id }}</span>
+            <span v-if="item.artwork_title" class="artwork-title">{{ item.artwork_title }}</span>
+            <span v-if="item.artist_name" class="artist-name">by {{ item.artist_name }}</span>
+          </div>
+        </div>
+      </div>
+    </div>
+
     <div class="task-status">
       <span class="status-badge" :class="statusClass">
         {{ getStatusText(task.status) }}
@@ -398,6 +428,81 @@ const cancelTask = async () => {
   margin-top: 0.25rem;
 }
 
+/* 批量下载进度样式 */
+.batch-progress {
+  margin: 1rem 0;
+  padding: 1rem;
+  background: #f8fafc;
+  border-radius: 0.5rem;
+  border: 1px solid #e2e8f0;
+}
+
+.batch-stats {
+  display: flex;
+  gap: 2rem;
+  margin-bottom: 1rem;
+}
+
+.stat-item {
+  display: flex;
+  align-items: center;
+  gap: 0.5rem;
+}
+
+.stat-label {
+  font-size: 0.875rem;
+  color: #6b7280;
+  font-weight: 500;
+}
+
+.stat-value {
+  font-size: 0.875rem;
+  font-weight: 600;
+}
+
+.stat-value.success {
+  color: #059669;
+}
+
+.stat-value.error {
+  color: #dc2626;
+}
+
+.recent-completed h4 {
+  font-size: 0.875rem;
+  font-weight: 600;
+  color: #374151;
+  margin: 0 0 0.5rem 0;
+}
+
+.completed-list {
+  display: flex;
+  flex-direction: column;
+  gap: 0.25rem;
+}
+
+.completed-item {
+  display: flex;
+  align-items: center;
+  gap: 0.5rem;
+  font-size: 0.75rem;
+  color: #6b7280;
+}
+
+.artwork-id {
+  font-weight: 600;
+  color: #3b82f6;
+}
+
+.artwork-title {
+  color: #374151;
+  font-weight: 500;
+}
+
+.artist-name {
+  color: #6b7280;
+}
+
 .task-error {
   display: flex;
   align-items: center;
@@ -413,4 +518,11 @@ const cancelTask = async () => {
 .error-icon {
   font-size: 1rem;
 }
+
+@media (max-width: 768px) {
+  .batch-stats {
+    flex-direction: column;
+    gap: 0.5rem;
+  }
+}
 </style> 
\ No newline at end of file
diff --git a/ui/src/services/download.ts b/ui/src/services/download.ts
index 093e211..596204e 100644
--- a/ui/src/services/download.ts
+++ b/ui/src/services/download.ts
@@ -128,6 +128,27 @@ class DownloadService {
     return apiService.get('/api/download/downloaded-ids');
   }
 
+  /**
+   * 清理历史记录
+   */
+  async cleanupHistory(keepCount = 500) {
+    return apiService.post('/api/download/cleanup/history', { keepCount });
+  }
+
+  /**
+   * 清理已完成的任务
+   */
+  async cleanupTasks(keepActive = true, keepCompleted = 100) {
+    return apiService.post('/api/download/cleanup/tasks', { keepActive, keepCompleted });
+  }
+
+  /**
+   * 获取系统统计信息
+   */
+  async getSystemStats() {
+    return apiService.get('/api/download/stats');
+  }
+
   /**
    * 使用SSE监听下载进度
    */
diff --git a/ui/src/types/index.ts b/ui/src/types/index.ts
index 3884e11..61cd13c 100644
--- a/ui/src/types/index.ts
+++ b/ui/src/types/index.ts
@@ -110,6 +110,11 @@ export interface DownloadTask {
   end_time?: string;
   error?: string;
   results?: any[];
+  recent_completed?: Array<{
+    artwork_id: number;
+    artwork_title?: string;
+    artist_name?: string;
+  }>;
 }
 
 // 搜索参数
diff --git a/ui/src/views/DownloadsView.vue b/ui/src/views/DownloadsView.vue
index a08bde3..824af2b 100644
--- a/ui/src/views/DownloadsView.vue
+++ b/ui/src/views/DownloadsView.vue
@@ -4,13 +4,25 @@
       <div class="page-header">
         <h1>下载管理</h1>
         <div class="header-actions">
-          <button @click="refreshData" class="btn btn-secondary" :disabled="loading">
-            <svg viewBox="0 0 24 24" fill="currentColor" class="w-4 h-4">
+          <button @click="refreshData" class="btn btn-primary" :disabled="loading">
+            <svg viewBox="0 0 24 24" fill="currentColor" class="btn-icon">
               <path
                 d="M17.65 6.35C16.2 4.9 14.21 4 12 4c-4.42 0-7.99 3.58-7.99 8s3.57 8 7.99 8c3.73 0 6.84-2.55 7.73-6h-2.08c-.82 2.33-3.04 4-5.65 4-3.31 0-6-2.69-6-6s2.69-6 6-6c1.66 0 3.14.69 4.22 1.78L13 11h7V4l-2.35 2.35z" />
             </svg>
             刷新
           </button>
+          <button @click="cleanupTasks" class="btn btn-secondary" :disabled="loading">
+            <svg viewBox="0 0 24 24" fill="currentColor" class="btn-icon">
+              <path d="M6 19c0 1.1.9 2 2 2h8c1.1 0 2-.9 2-2V7H6v12zM19 4h-3.5l-1-1h-5l-1 1H5v2h14V4z" />
+            </svg>
+            清理任务
+          </button>
+          <button @click="cleanupHistory" class="btn btn-secondary" :disabled="loading">
+            <svg viewBox="0 0 24 24" fill="currentColor" class="btn-icon">
+              <path d="M13 3c-4.97 0-9 4.03-9 9H1l3.89 3.89.07.14L9 12H6c0-3.87 3.13-7 7-7s7 3.13 7 7-3.13 7-7 7c-1.93 0-3.68-.79-4.94-2.06l-1.42 1.42C8.27 19.99 10.51 21 13 21c4.97 0 9-4.03 9-9s-4.03-9-9-9zm-1 5v5l4.28 2.54.72-1.21-3.5-2.08V8H12z" />
+            </svg>
+            清理历史
+          </button>
         </div>
       </div>
 
@@ -26,9 +38,6 @@
         <button @click="activeTab = 'history'" class="tab-btn" :class="{ active: activeTab === 'history' }">
           下载历史
         </button>
-        <button @click="activeTab = 'files'" class="tab-btn" :class="{ active: activeTab === 'files' }">
-          文件管理
-        </button>
       </div>
 
       <!-- 下载任务 -->
@@ -37,7 +46,7 @@
           <LoadingSpinner text="加载中..." />
         </div>
 
-        <div v-else-if="tasks.length === 0" class="empty-section">
+        <div v-else-if="activeTasks.length === 0" class="empty-section">
           <div class="empty-content">
             <svg viewBox="0 0 24 24" fill="currentColor" class="empty-icon">
               <path
@@ -49,7 +58,7 @@
         </div>
 
         <div v-else class="tasks-list">
-          <div v-for="task in tasks" :key="task.id" class="task-card">
+          <div v-for="task in activeTasks" :key="task.id" class="task-card">
             <div class="task-header">
               <div class="task-info">
                 <h3 class="task-title">
@@ -75,6 +84,36 @@
               </div>
             </div>
 
+            <!-- 批量下载的详细进度 -->
+            <div v-if="task.type === 'batch' || task.type === 'artist'" class="batch-progress">
+              <div class="batch-stats">
+                <div class="stat-item">
+                  <span class="stat-label">已完成:</span>
+                  <span class="stat-value success">{{ task.completed_files }}</span>
+                </div>
+                <div class="stat-item">
+                  <span class="stat-label">失败:</span>
+                  <span class="stat-value error">{{ task.failed_files }}</span>
+                </div>
+                <div class="stat-item">
+                  <span class="stat-label">剩余:</span>
+                  <span class="stat-value">{{ task.total_files - task.completed_files - task.failed_files }}</span>
+                </div>
+              </div>
+
+              <!-- 最近完成的作品列表 -->
+              <div v-if="task.recent_completed && task.recent_completed.length > 0" class="recent-completed">
+                <h4>最近完成:</h4>
+                <div class="completed-list">
+                  <div v-for="item in task.recent_completed.slice(0, 5)" :key="item.artwork_id" class="completed-item">
+                    <span class="artwork-id">#{{ item.artwork_id }}</span>
+                    <span v-if="item.artwork_title" class="artwork-title">{{ item.artwork_title }}</span>
+                    <span v-if="item.artist_name" class="artist-name">by {{ item.artist_name }}</span>
+                  </div>
+                </div>
+              </div>
+            </div>
+
             <div class="task-details">
               <div class="detail-item">
                 <span class="label">类型:</span>
@@ -125,11 +164,6 @@
                   {{ getStatusText(item.status) }}
                 </span>
               </div>
-              <div class="history-actions">
-                <button @click="openFolder(item.download_path)" class="btn btn-text btn-sm">
-                  打开文件夹
-                </button>
-              </div>
             </div>
 
             <div class="history-details">
@@ -141,10 +175,6 @@
                 <span class="label">文件数:</span>
                 <span class="value">{{ item.completed_files }}/{{ item.total_files }}</span>
               </div>
-              <div class="detail-item">
-                <span class="label">下载路径:</span>
-                <span class="value path">{{ item.download_path }}</span>
-              </div>
               <div class="detail-item">
                 <span class="label">完成时间:</span>
                 <span class="value">{{ formatDate(item.end_time) }}</span>
@@ -153,90 +183,43 @@
           </div>
         </div>
       </div>
-
-      <!-- 文件管理 -->
-      <div v-if="activeTab === 'files'" class="tab-content">
-        <div v-if="loading" class="loading-section">
-          <LoadingSpinner text="加载中..." />
-        </div>
-
-        <div v-else-if="files.length === 0" class="empty-section">
-          <div class="empty-content">
-            <svg viewBox="0 0 24 24" fill="currentColor" class="empty-icon">
-              <path
-                d="M20 6h-8l-2-2H4c-1.1 0-1.99.9-1.99 2L2 18c0 1.1.9 2 2 2h16c1.1 0 2-.9 2-2V8c0-1.1-.9-2-2-2zm0 12H4V8h16v10z" />
-            </svg>
-            <h3>暂无下载文件</h3>
-            <p>下载完成后，文件将显示在这里</p>
-          </div>
-        </div>
-
-        <div v-else class="files-list">
-          <div v-for="file in files" :key="`${file.artist}_${file.artwork}`" class="file-card">
-            <div class="file-header">
-              <div class="file-info">
-                <h3 class="file-title">{{ file.artwork }}</h3>
-                <p class="file-artist">{{ file.artist }}</p>
-              </div>
-              <div class="file-actions">
-                <button @click="openFolder(file.path)" class="btn btn-text btn-sm">
-                  打开
-                </button>
-                <button @click="deleteFile(file.artist, file.artwork)" class="btn btn-danger btn-sm">
-                  删除
-                </button>
-              </div>
-            </div>
-
-            <div class="file-details">
-              <div class="detail-item">
-                <span class="label">文件数:</span>
-                <span class="value">{{ file.files.length }}</span>
-              </div>
-              <div class="detail-item">
-                <span class="label">大小:</span>
-                <span class="value">{{ formatFileSize(file.total_size) }}</span>
-              </div>
-              <div class="detail-item">
-                <span class="label">创建时间:</span>
-                <span class="value">{{ formatDate(file.created_at) }}</span>
-              </div>
-            </div>
-          </div>
-        </div>
-      </div>
     </div>
   </div>
 </template>
 
 <script setup lang="ts">
-import { ref, onMounted, onUnmounted } from 'vue';
+import { ref, computed, onMounted, onUnmounted } from 'vue';
 import { useAuthStore } from '@/stores/auth';
 import downloadService from '@/services/download';
 import type { DownloadTask } from '@/types';
 
-
 const authStore = useAuthStore();
 
 // 状态
-const activeTab = ref<'tasks' | 'history' | 'files'>('tasks');
+const activeTab = ref<'tasks' | 'history'>('tasks');
 const loading = ref(false);
 const error = ref<string | null>(null);
 const tasks = ref<DownloadTask[]>([]);
 const history = ref<any[]>([]);
-const files = ref<any[]>([]);
 
-// 定时器
-let progressTimer: number | null = null;
+// SSE连接管理
+const sseConnections = ref<Map<string, () => void>>(new Map());
+
+// 计算属性：只显示活跃任务
+const activeTasks = computed(() => {
+  return tasks.value.filter(task =>
+    ['downloading', 'paused'].includes(task.status)
+  );
+});
 
 // 获取任务标题
 const getTaskTitle = (task: DownloadTask) => {
   if (task.type === 'artwork') {
-    return `作品 ${task.artwork_id}`;
+    return task.artwork_title || `作品 ${task.artwork_id}`;
   } else if (task.type === 'artist') {
-    return `作者作品`;
+    return `作者作品 - ${task.artist_name || '未知作者'}`;
   } else if (task.type === 'batch') {
-    return `批量下载 ${task.total_files} 个作品`;
+    return `批量下载 (${task.total_files} 个作品)`;
   }
   return '未知任务';
 };
@@ -248,7 +231,8 @@ const getStatusText = (status: string) => {
     'completed': '已完成',
     'failed': '失败',
     'cancelled': '已取消',
-    'partial': '部分完成'
+    'partial': '部分完成',
+    'paused': '已暂停'
   };
   return statusMap[status] || status;
 };
@@ -258,7 +242,8 @@ const getTypeText = (type: string) => {
   const typeMap: Record<string, string> = {
     'artwork': '单个作品',
     'artist': '作者作品',
-    'batch': '批量下载'
+    'batch': '批量下载',
+    'ranking': '排行榜下载'
   };
   return typeMap[type] || type;
 };
@@ -274,30 +259,35 @@ const getHistoryTitle = (item: any) => {
     return `作者作品 (${artist})`;
   } else if (item.type === 'batch') {
     return `批量下载 (${item.total_files || 0} 个作品)`;
+  } else if (item.type === 'ranking') {
+    return `排行榜下载 (${item.total_files || 0} 个作品)`;
   }
   return '未知下载任务';
 };
 
 // 格式化日期
 const formatDate = (dateString: string) => {
-  return new Date(dateString).toLocaleString('zh-CN');
-};
+  if (!dateString) return '未知时间';
 
-// 格式化文件大小
-const formatFileSize = (bytes: number) => {
-  if (bytes === 0) return '0 B';
-  const k = 1024;
-  const sizes = ['B', 'KB', 'MB', 'GB'];
-  const i = Math.floor(Math.log(bytes) / Math.log(k));
-  return parseFloat((bytes / Math.pow(k, i)).toFixed(2)) + ' ' + sizes[i];
+  try {
+    // 处理不同的日期格式
+    const date = new Date(dateString);
+    if (isNaN(date.getTime())) {
+      console.warn('无效的日期格式:', dateString);
+      return '时间格式错误';
+    }
+    return date.toLocaleString('zh-CN');
+  } catch (error) {
+    console.error('日期格式化错误:', error);
+    return '时间解析失败';
+  }
 };
 
 // 刷新数据
 const refreshData = async () => {
   await Promise.all([
     fetchTasks(),
-    fetchHistory(),
-    fetchFiles()
+    fetchHistory()
   ]);
 };
 
@@ -307,6 +297,13 @@ const fetchTasks = async () => {
     const response = await downloadService.getAllTasks();
     if (response.success) {
       tasks.value = response.data || [];
+
+      // 为活跃任务建立SSE连接
+      activeTasks.value.forEach(task => {
+        if (!sseConnections.value.has(task.id)) {
+          startTaskStreaming(task.id);
+        }
+      });
     } else {
       throw new Error(response.error || '获取任务列表失败');
     }
@@ -315,12 +312,14 @@ const fetchTasks = async () => {
   }
 };
 
-// 获取历史记录
+// 获取历史记录（只获取最近200条）
 const fetchHistory = async () => {
   try {
-    const response = await downloadService.getDownloadHistory();
-    if (response.success) {
-      history.value = response.data || [];
+    const response = await downloadService.getDownloadHistory(0, 200);
+    if (response.success && response.data) {
+      // 后端返回的结构是 { history: [], total: number, offset: number, limit: number }
+      history.value = response.data.history || [];
+      console.log('历史记录获取成功:', history.value.length, '条记录');
     } else {
       throw new Error(response.error || '获取历史记录失败');
     }
@@ -329,17 +328,57 @@ const fetchHistory = async () => {
   }
 };
 
-// 获取文件列表
-const fetchFiles = async () => {
-  try {
-    const response = await downloadService.getDownloadedFiles();
-    if (response.success) {
-      files.value = response.data || [];
-    } else {
-      throw new Error(response.error || '获取文件列表失败');
+// 开始SSE监听任务进度
+const startTaskStreaming = (taskId: string) => {
+  // 如果已经有连接，先关闭
+  if (sseConnections.value.has(taskId)) {
+    sseConnections.value.get(taskId)!();
+  }
+
+  console.log('开始SSE监听任务进度:', taskId);
+
+  const closeConnection = downloadService.streamTaskProgress(
+    taskId,
+    (task) => {
+      console.log('收到SSE进度更新:', {
+        taskId,
+        status: task.status,
+        progress: task.progress,
+        completed: task.completed_files,
+        total: task.total_files
+      });
+
+      // 更新任务状态
+      const index = tasks.value.findIndex(t => t.id === taskId);
+      if (index !== -1) {
+        tasks.value[index] = task;
+      }
+
+      // 如果任务完成，清理连接
+      if (['completed', 'failed', 'cancelled', 'partial'].includes(task.status)) {
+        console.log('任务完成，关闭SSE连接:', taskId);
+        stopTaskStreaming(taskId);
+
+        // 延迟刷新历史记录
+        setTimeout(() => {
+          fetchHistory();
+        }, 1000);
+      }
+    },
+    () => {
+      console.log('SSE连接完成:', taskId);
+      stopTaskStreaming(taskId);
     }
-  } catch (err) {
-    console.error('获取文件列表失败:', err);
+  );
+
+  sseConnections.value.set(taskId, closeConnection);
+};
+
+// 停止SSE监听
+const stopTaskStreaming = (taskId: string) => {
+  if (sseConnections.value.has(taskId)) {
+    sseConnections.value.get(taskId)!();
+    sseConnections.value.delete(taskId);
   }
 };
 
@@ -358,30 +397,46 @@ const cancelTask = async (taskId: string) => {
   }
 };
 
-// 删除文件
-const deleteFile = async (artist: string, artwork: string) => {
-  if (!confirm(`确定要删除 "${artist}/${artwork}" 的所有文件吗？`)) {
-    return;
-  }
-
-  try {
-    const response = await downloadService.deleteDownloadedFiles(artist, artwork);
-    if (response.success) {
-      await fetchFiles();
-    } else {
-      throw new Error(response.error || '删除文件失败');
+// 清理历史记录
+const cleanupHistory = async () => {
+  if (confirm('确定要清理下载历史吗？这将保留最新的500条记录。')) {
+    try {
+      loading.value = true;
+      const response = await downloadService.cleanupHistory(500);
+      if (response.success) {
+        await fetchHistory(); // 重新获取历史记录
+        alert('下载历史已清理！');
+      } else {
+        throw new Error(response.error || '清理历史失败');
+      }
+    } catch (err) {
+      error.value = err instanceof Error ? err.message : '清理历史失败';
+      console.error('清理历史失败:', err);
+    } finally {
+      loading.value = false;
     }
-  } catch (err) {
-    error.value = err instanceof Error ? err.message : '删除文件失败';
-    console.error('删除文件失败:', err);
   }
 };
 
-// 打开文件夹
-const openFolder = (path: string) => {
-  // 这里可以调用系统API打开文件夹
-  console.log('打开文件夹:', path);
-  // 在实际应用中，可以通过electron或其他方式打开文件夹
+// 清理任务
+const cleanupTasks = async () => {
+  if (confirm('确定要清理已完成的任务吗？这将保留活跃任务和最新的100个已完成任务。')) {
+    try {
+      loading.value = true;
+      const response = await downloadService.cleanupTasks(true, 100);
+      if (response.success) {
+        await fetchTasks(); // 重新获取任务列表
+        alert('下载任务已清理！');
+      } else {
+        throw new Error(response.error || '清理任务失败');
+      }
+    } catch (err) {
+      error.value = err instanceof Error ? err.message : '清理任务失败';
+      console.error('清理任务失败:', err);
+    } finally {
+      loading.value = false;
+    }
+  }
 };
 
 // 清除错误
@@ -389,29 +444,18 @@ const clearError = () => {
   error.value = null;
 };
 
-// 开始进度轮询
-const startProgressPolling = () => {
-  progressTimer = setInterval(async () => {
-    const hasActiveTasks = tasks.value.some(task => task.status === 'downloading');
-    if (hasActiveTasks) {
-      await fetchTasks();
-    }
-  }, 2000);
-};
-
-// 停止进度轮询
-const stopProgressPolling = () => {
-  if (progressTimer) {
-    clearInterval(progressTimer);
-    progressTimer = null;
-  }
+// 清理所有SSE连接
+const cleanupSSEConnections = () => {
+  sseConnections.value.forEach(closeConnection => {
+    closeConnection();
+  });
+  sseConnections.value.clear();
 };
 
 onMounted(async () => {
   loading.value = true;
   try {
     await refreshData();
-    startProgressPolling();
   } catch (err) {
     error.value = err instanceof Error ? err.message : '加载数据失败';
   } finally {
@@ -420,7 +464,7 @@ onMounted(async () => {
 });
 
 onUnmounted(() => {
-  stopProgressPolling();
+  cleanupSSEConnections();
 });
 </script>
 
@@ -451,6 +495,66 @@ onUnmounted(() => {
   margin: 0;
 }
 
+.header-actions {
+  display: flex;
+  gap: 0.75rem;
+  align-items: center;
+}
+
+.btn {
+  display: inline-flex;
+  align-items: center;
+  gap: 0.5rem;
+  padding: 0.75rem 1.25rem;
+  border: none;
+  border-radius: 0.5rem;
+  font-size: 0.875rem;
+  font-weight: 500;
+  cursor: pointer;
+  transition: all 0.2s ease;
+  text-decoration: none;
+  white-space: nowrap;
+  box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
+}
+
+.btn:disabled {
+  opacity: 0.5;
+  cursor: not-allowed;
+  pointer-events: none;
+}
+
+.btn-icon {
+  width: 1.25rem;
+  height: 1.25rem;
+  flex-shrink: 0;
+}
+
+.btn-primary {
+  background: #3b82f6;
+  color: white;
+  border: 1px solid #3b82f6;
+}
+
+.btn-primary:hover:not(:disabled) {
+  background: #2563eb;
+  border-color: #2563eb;
+  transform: translateY(-1px);
+  box-shadow: 0 4px 6px -1px rgba(59, 130, 246, 0.3);
+}
+
+.btn-secondary {
+  background: white;
+  color: #374151;
+  border: 1px solid #d1d5db;
+}
+
+.btn-secondary:hover:not(:disabled) {
+  background: #f9fafb;
+  border-color: #9ca3af;
+  transform: translateY(-1px);
+  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
+}
+
 .tabs {
   display: flex;
   gap: 0.5rem;
@@ -521,14 +625,12 @@ onUnmounted(() => {
 }
 
 .tasks-list,
-.history-list,
-.files-list {
+.history-list {
   padding: 1.5rem;
 }
 
 .task-card,
-.history-card,
-.file-card {
+.history-card {
   border: 1px solid #e5e7eb;
   border-radius: 0.75rem;
   padding: 1.5rem;
@@ -539,15 +641,13 @@ onUnmounted(() => {
 }
 
 .task-card:hover,
-.history-card:hover,
-.file-card:hover {
+.history-card:hover {
   box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
   border-color: #d1d5db;
 }
 
 .task-header,
-.history-header,
-.file-header {
+.history-header {
   display: flex;
   justify-content: space-between;
   align-items: flex-start;
@@ -555,8 +655,7 @@ onUnmounted(() => {
 }
 
 .task-title,
-.history-title,
-.file-title {
+.history-title {
   font-size: 1.125rem;
   font-weight: 600;
   color: #1f2937;
@@ -603,6 +702,11 @@ onUnmounted(() => {
   color: #d97706;
 }
 
+.task-status.paused {
+  background: #fef3c7;
+  color: #d97706;
+}
+
 .task-progress {
   margin-bottom: 1rem;
 }
@@ -628,9 +732,83 @@ onUnmounted(() => {
   text-align: center;
 }
 
+/* 批量下载进度样式 */
+.batch-progress {
+  margin-bottom: 1rem;
+  padding: 1rem;
+  background: #f8fafc;
+  border-radius: 0.5rem;
+  border: 1px solid #e2e8f0;
+}
+
+.batch-stats {
+  display: flex;
+  gap: 2rem;
+  margin-bottom: 1rem;
+}
+
+.stat-item {
+  display: flex;
+  align-items: center;
+  gap: 0.5rem;
+}
+
+.stat-label {
+  font-size: 0.875rem;
+  color: #6b7280;
+  font-weight: 500;
+}
+
+.stat-value {
+  font-size: 0.875rem;
+  font-weight: 600;
+}
+
+.stat-value.success {
+  color: #059669;
+}
+
+.stat-value.error {
+  color: #dc2626;
+}
+
+.recent-completed h4 {
+  font-size: 0.875rem;
+  font-weight: 600;
+  color: #374151;
+  margin: 0 0 0.5rem 0;
+}
+
+.completed-list {
+  display: flex;
+  flex-direction: column;
+  gap: 0.25rem;
+}
+
+.completed-item {
+  display: flex;
+  align-items: center;
+  gap: 0.5rem;
+  font-size: 0.75rem;
+  color: #6b7280;
+}
+
+.artwork-id {
+  font-weight: 600;
+  color: #3b82f6;
+}
+
+.artwork-title {
+  color: #374151;
+  font-weight: 500;
+}
+
+.artist-name {
+  color: #6b7280;
+}
+
 .task-details,
-.history-details,
-.file-details {
+.history-details {
   display: grid;
   grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
   gap: 0.5rem;
@@ -658,20 +836,8 @@ onUnmounted(() => {
   color: #dc2626;
 }
 
-.detail-item .value.path {
-  font-family: monospace;
-  font-size: 0.75rem;
-  word-break: break-all;
-}
-
-.file-artist {
-  font-size: 0.875rem;
-  color: #6b7280;
-  margin: 0;
-}
-
 .btn-sm {
-  padding: 0.25rem 0.5rem;
+  padding: 0.5rem 0.75rem;
   font-size: 0.75rem;
 }
 
@@ -681,18 +847,44 @@ onUnmounted(() => {
   border: 1px solid #dc2626;
 }
 
-.btn-danger:hover {
+.btn-danger:hover:not(:disabled) {
   background: #b91c1c;
   border-color: #b91c1c;
+  transform: translateY(-1px);
+  box-shadow: 0 4px 6px -1px rgba(220, 38, 38, 0.3);
 }
 
-.btn-text {
-  background: none;
-  color: #3b82f6;
-  border: none;
-}
+@media (max-width: 768px) {
+  .container {
+    padding: 0 1rem;
+  }
 
-.btn-text:hover {
-  background: #f3f4f6;
+  .page-header {
+    flex-direction: column;
+    gap: 1rem;
+    align-items: flex-start;
+  }
+
+  .header-actions {
+    width: 100%;
+    justify-content: flex-start;
+    flex-wrap: wrap;
+    gap: 0.5rem;
+  }
+
+  .btn {
+    padding: 0.625rem 1rem;
+    font-size: 0.8125rem;
+  }
+
+  .batch-stats {
+    flex-direction: column;
+    gap: 0.5rem;
+  }
+
+  .task-details,
+  .history-details {
+    grid-template-columns: 1fr;
+  }
 }
 </style>
\ No newline at end of file