diff --git a/backend/database.js b/backend/database.js
index 7188c31..f711ff4 100644
--- a/backend/database.js
+++ b/backend/database.js
@@ -497,9 +497,9 @@ const PasswordResetDB = {
 
 // 初始化默认设置
 function initDefaultSettings() {
-  // 默认上传限制为100MB
+  // 默认上传限制为10GB
   if (!SettingsDB.get('max_upload_size')) {
-    SettingsDB.set('max_upload_size', '104857600'); // 100MB in bytes
+    SettingsDB.set('max_upload_size', '10737418240'); // 10GB in bytes
   }
 }
 
diff --git a/backend/server.js b/backend/server.js
index d46e1da..b0ac7b7 100644
--- a/backend/server.js
+++ b/backend/server.js
@@ -644,7 +644,7 @@ app.post('/api/upload', authMiddleware, upload.single('file'), async (req, res)
   }
 
   // 检查文件大小限制
-  const maxUploadSize = parseInt(SettingsDB.get('max_upload_size') || '104857600');
+  const maxUploadSize = parseInt(SettingsDB.get('max_upload_size') || '10737418240');
   if (req.file.size > maxUploadSize) {
     // 删除已上传的临时文件
     if (fs.existsSync(req.file.path)) {
@@ -1530,7 +1530,7 @@ app.get('/api/share/:code/download-file', async (req, res) => {
 // 获取系统设置
 app.get('/api/admin/settings', authMiddleware, adminMiddleware, (req, res) => {
   try {
-    const maxUploadSize = parseInt(SettingsDB.get('max_upload_size') || '104857600');
+    const maxUploadSize = parseInt(SettingsDB.get('max_upload_size') || '10737418240');
 
     res.json({
       success: true,