diff --git a/README.md b/README.md
index 5da3e8f..ee98df5 100644
--- a/README.md
+++ b/README.md
@@ -4,6 +4,53 @@
 
 Electron 跨平台桌面网盘应用
 
+## 技术栈
+
+### 前端
+- Electron 28+ (桌面框架)
+- React 18 (UI框架)
+- TypeScript (类型安全)
+- Zustand (状态管理)
+- Ant Design 5 (UI组件库)
+
+### 后端
+- Node.js 20+ (运行环境)
+- Express 4 (Web框架)
+- SQLite3 (本地数据库)
+- JWT (用户认证)
+- Multer (文件上传)
+
+## 功能特性
+
+- ✅ 用户注册/登录
+- ✅ 文件上传/下载/删除
+- ✅ 文件夹管理
+- ✅ 分享功能（密码保护/链接分享）
+- 🔄 云端同步
+- ⏳ 离线访问
+- ⏳ 主题切换
+
+## 开发指南
+
+### 前端开发
+```bash
+cd frontend
+npm install
+npm run dev
+```
+
+### 后端开发
+```bash
+cd backend
+npm install
+npm run dev
+```
+
+### 测试
+```bash
+npm test
+```
+
 ## 团队成员
 
 | 角色 | 账号 |
@@ -21,7 +68,11 @@ Electron 跨平台桌面网盘应用
 ├── prd/                 # 产品需求文档
 ├── ui-design/           # UI设计文件
 ├── architecture/        # 架构设计文档
-├── frontend/            # 前端代码
+├── frontend/           # 前端代码
 ├── backend/            # 后端代码
 └── tests/              # 测试代码
 ```
+
+## Git 仓库
+
+https://git.liantu.tech/openclaw_product_manager/clouddisk-project
diff --git a/backend/src/index.js b/backend/src/index.js
index 3e7e4e7..f1f0bc7 100644
--- a/backend/src/index.js
+++ b/backend/src/index.js
@@ -3,6 +3,7 @@ const cors = require('cors');
 const authRoutes = require('./routes/auth');
 const fileRoutes = require('./routes/files');
 const shareRoutes = require('./routes/share');
+const syncRoutes = require('./routes/sync');
 
 const app = express();
 const PORT = process.env.PORT || 3000;
@@ -14,6 +15,7 @@ app.use(express.json());
 app.use('/api/auth', authRoutes);
 app.use('/api/files', fileRoutes);
 app.use('/api/share', shareRoutes);
+app.use('/api/sync', syncRoutes);
 
 // Health check
 app.get('/api/health', (req, res) => {
diff --git a/backend/src/routes/sync.js b/backend/src/routes/sync.js
new file mode 100644
index 0000000..88d30ec
--- /dev/null
+++ b/backend/src/routes/sync.js
@@ -0,0 +1,152 @@
+const express = require('express');
+const crypto = require('crypto');
+const fs = require('fs');
+const path = require('path');
+const db = require('../db');
+
+const router = express.Router();
+
+// Get sync status
+router.get('/status', (req, res) => {
+  const token = req.headers.authorization?.replace('Bearer ', '');
+  if (!token) return res.status(401).json({ error: 'No token' });
+  
+  try {
+    const jwt = require('jsonwebtoken');
+    const decoded = jwt.verify(token, process.env.JWT_SECRET || 'clouddisk-secret-key');
+    
+    const status = db.query(
+      'SELECT * FROM sync_status WHERE user_id = ?',
+      [decoded.userId]
+    );
+    
+    if (status.length === 0) {
+      // Create initial sync status
+      const result = db.run(
+        'INSERT INTO sync_status (user_id) VALUES (?)',
+        [decoded.userId]
+      );
+      return res.json({ 
+        status: 'idle', 
+        totalFiles: 0, 
+        syncedFiles: 0 
+      });
+    }
+    
+    res.json({
+      status: status[0].status,
+      lastSyncTime: status[0].last_sync_time,
+      totalFiles: status[0].total_files,
+      syncedFiles: status[0].synced_files
+    });
+  } catch (error) {
+    res.status(500).json({ error: error.message });
+  }
+});
+
+// Start sync
+router.post('/start', (req, res) => {
+  const token = req.headers.authorization?.replace('Bearer ', '');
+  if (!token) return res.status(401).json({ error: 'No token' });
+  
+  try {
+    const jwt = require('jsonwebtoken');
+    const decoded = jwt.verify(token, process.env.JWT_SECRET || 'clouddisk-secret-key');
+    
+    // Update sync status
+    db.run(
+      'UPDATE sync_status SET status = ?, last_sync_time = CURRENT_TIMESTAMP WHERE user_id = ?',
+      ['syncing', decoded.userId]
+    );
+    
+    res.json({ success: true, message: 'Sync started' });
+  } catch (error) {
+    res.status(500).json({ error: error.message });
+  }
+});
+
+// Calculate file hash for deduplication
+function calculateFileHash(filePath) {
+  return new Promise((resolve, reject) => {
+    const hash = crypto.createHash('md5');
+    const stream = fs.createReadStream(filePath);
+    stream.on('data', data => hash.update(data));
+    stream.on('end', () => resolve(hash.digest('hex')));
+    stream.on('error', reject);
+  });
+}
+
+// Sync single file (for client to call)
+router.post('/file', (req, res) => {
+  const token = req.headers.authorization?.replace('Bearer ', '');
+  if (!token) return res.status(401).json({ error: 'No token' });
+  
+  try {
+    const jwt = require('jsonwebtoken');
+    const decoded = jwt.verify(token, process.env.JWT_SECRET || 'clouddisk-secret-key');
+    
+    const { fileId, localHash, localModified } = req.body;
+    
+    // Get server file info
+    const serverFile = db.query(
+      'SELECT * FROM files WHERE id = ? AND user_id = ?',
+      [fileId, decoded.userId]
+    );
+    
+    if (serverFile.length === 0) {
+      return res.status(404).json({ error: 'File not found' });
+    }
+    
+    // Determine sync action
+    let action = 'up-to-date';
+    
+    if (!serverFile[0].hash || serverFile[0].hash !== localHash) {
+      // Need to upload
+      action = 'upload';
+    }
+    
+    res.json({ 
+      action,
+      serverModified: serverFile[0].updated_at,
+      serverHash: serverFile[0].hash
+    });
+  } catch (error) {
+    res.status(500).json({ error: error.message });
+  }
+});
+
+// Get local files that need syncing
+router.get('/pending', (req, res) => {
+  const token = req.headers.authorization?.replace('Bearer ', '');
+  if (!token) return res.status(401).json({ error: 'No token' });
+  
+  try {
+    const jwt = require('jsonwebtoken');
+    const decoded = jwt.verify(token, process.env.JWT_SECRET || 'clouddisk-secret-key');
+    
+    // Get files modified since last sync
+    const lastSync = db.query(
+      'SELECT last_sync_time FROM sync_status WHERE user_id = ?',
+      [decoded.userId]
+    );
+    
+    let query;
+    let params;
+    
+    if (lastSync.length > 0 && lastSync[0].last_sync_time) {
+      query = 'SELECT * FROM files WHERE user_id = ? AND updated_at > ?';
+      params = [decoded.userId, lastSync[0].last_sync_time];
+    } else {
+      query = 'SELECT * FROM files WHERE user_id = ?';
+      params = [decoded.userId];
+    }
+    
+    const files = db.query(query, params);
+    
+    res.json({ files });
+  } catch (error) {
+    res.status(500).json({ error: error.message });
+  }
+});
+
+module.exports = router;
diff --git a/frontend/src/renderer/components/SyncStatus.jsx b/frontend/src/renderer/components/SyncStatus.jsx
new file mode 100644
index 0000000..c41e9d8
--- /dev/null
+++ b/frontend/src/renderer/components/SyncStatus.jsx
@@ -0,0 +1,114 @@
+import React, { useState, useEffect } from 'react';
+import { Badge, Button, Progress, Tooltip } from 'antd';
+import { SyncOutlined, CheckCircleOutlined, ClockCircleOutlined } from '@ant-design/icons';
+
+function SyncStatus() {
+  const [status, setStatus] = useState('idle');
+  const [lastSync, setLastSync] = useState(null);
+  const [syncedFiles, setSyncedFiles] = useState(0);
+  const [totalFiles, setTotalFiles] = useState(0);
+  const [syncing, setSyncing] = useState(false);
+
+  useEffect(() => {
+    fetchSyncStatus();
+    // Poll status every 30 seconds
+    const interval = setInterval(fetchSyncStatus, 30000);
+    return () => clearInterval(interval);
+  }, []);
+
+  const fetchSyncStatus = async () => {
+    try {
+      const token = localStorage.getItem('token');
+      const response = await fetch('/api/sync/status', {
+        headers: { 'Authorization': `Bearer ${token}` }
+      });
+      const data = await response.json();
+      setStatus(data.status);
+      setLastSync(data.lastSyncTime);
+      setSyncedFiles(data.syncedFiles);
+      setTotalFiles(data.totalFiles);
+    } catch (error) {
+      console.error('Failed to fetch sync status:', error);
+    }
+  };
+
+  const handleSync = async () => {
+    setSyncing(true);
+    try {
+      const token = localStorage.getItem('token');
+      await fetch('/api/sync/start', {
+        method: 'POST',
+        headers: { 'Authorization': `Bearer ${token}` }
+      });
+      // Start polling for progress
+      const interval = setInterval(async () => {
+        await fetchSyncStatus();
+        if (status === 'idle' || status === 'completed') {
+          setSyncing(false);
+          clearInterval(interval);
+        }
+      }, 2000);
+    } catch (error) {
+      console.error('Failed to start sync:', error);
+      setSyncing(false);
+    }
+  };
+
+  const getStatusBadge = () => {
+    switch (status) {
+      case 'syncing':
+        return <Badge status="processing" text="同步中" />;
+      case 'completed':
+        return <Badge status="success" text="已同步" />;
+      case 'error':
+        return <Badge status="error" text="同步失败" />;
+      default:
+        return <Badge status="default" text="未同步" />;
+    }
+  };
+
+  const getProgress = () => {
+    if (totalFiles === 0) return 0;
+    return Math.round((syncedFiles / totalFiles) * 100);
+  };
+
+  return (
+    <div style={{ 
+      display: 'flex', 
+      alignItems: 'center', 
+      gap: '16px',
+      padding: '8px 16px',
+      background: '#f5f5f5',
+      borderRadius: '4px'
+    }}>
+      <SyncOutlined spin={syncing} style={{ fontSize: '20px' }} />
+      <div>
+        <div style={{ marginBottom: '4px' }}>{getStatusBadge()}</div>
+        {lastSync && (
+          <div style={{ fontSize: '12px', color: '#888' }}>
+            <ClockCircleOutlined /> 最后同步: {new Date(lastSync).toLocaleString()}
+          </div>
+        )}
+      </div>
+      {totalFiles > 0 && (
+        <Progress 
+          type="circle" 
+          percent={getProgress()} 
+          width={40}
+          style={{ marginLeft: 'auto' }}
+        />
+      )}
+      <Button 
+        type="primary" 
+        size="small" 
+        icon={<SyncOutlined />} 
+        onClick={handleSync}
+        loading={syncing}
+      >
+        {syncing ? '同步中' : '立即同步'}
+      </Button>
+    </div>
+  );
+}
+
+export default SyncStatus;