diff --git a/src/services/storage/TransferService.ts b/src/services/storage/TransferService.ts
index 4fe6c10..b753bfc 100644
--- a/src/services/storage/TransferService.ts
+++ b/src/services/storage/TransferService.ts
@@ -1,5 +1,6 @@
 import { rclone_api_post, rclone_api_exec_async } from '../../utils/rclone/request'
 import { convertStoragePath, formatPathRclone, getFileName } from './StorageManager'
+import { logger } from '../LoggerService'
 
 /**
  * Copy a file from one location to another
@@ -148,6 +149,7 @@ async function moveDir(
  * @param destStoragename - Destination storage name
  * @param destPath - Destination directory path
  * @param bisync - If true, perform bidirectional sync (default: false)
+ * @param resync - If true, force resync for bisync (default: false)
  * @throws Error if source or destination is invalid
  */
 async function sync(
@@ -155,7 +157,8 @@ async function sync(
   path: string,
   destStoragename: string,
   destPath: string,
-  bisync?: boolean
+  bisync?: boolean,
+  resync?: boolean
 ) {
   //bisync: 双向同步
 
@@ -191,14 +194,72 @@ async function sync(
       throw new Error('Invalid source or destination path')
     }
 
-    success = await rclone_api_exec_async('/sync/bisync', {
+    const params: Record<string, unknown> = {
       path1,
       path2,
-    })
+    }
+
+    // 添加resync标志以处理首次同步或同步状态丢失的情况
+    if (resync) {
+      params.resync = true
+    }
+
+    success = await rclone_api_exec_async('/sync/bisync', params)
     if (!success) {
       throw new Error(`Bidirectional sync failed: ${path1} <-> ${path2}`)
     }
   }
 }
+  if (!path || !destPath) {
+    throw new Error('Source or destination path is empty')
+  }
+
+  let success: boolean
+  if (!bisync) {
+    const srcFs = convertStoragePath(storageName, path, true)
+    const dstFs = convertStoragePath(destStoragename, destPath, true)
+
+    if (!srcFs || !dstFs) {
+      throw new Error('Invalid source or destination path')
+    }
+
+    success = await rclone_api_exec_async('/sync/sync', {
+      srcFs,
+      dstFs,
+    })
+    if (!success) {
+      throw new Error(`Sync failed: ${srcFs} -> ${dstFs}`)
+    }
+  } else {
+    const path1 = convertStoragePath(storageName, path, true)
+    const path2 = convertStoragePath(destStoragename, destPath, true)
+
+    if (!path1 || !path2) {
+      throw new Error('Invalid source or destination path')
+    }
+
+    // 双向同步：首次运行或同步状态丢失时需要 resync
+    // rclone bisync 要求首次运行时传入 --resync 参数
+    // 通过 _async + extra 参数传递
+    success = await rclone_api_exec_async('/sync/bisync', {
+      path1,
+      path2,
+      _resync: false, // 默认不 resync，rclone 会自动检测是否需要
+    })
+
+    if (!success) {
+      // 如果失败，可能是首次运行需要 resync
+      logger.info('Bisync failed, retrying with --resync flag', 'TransferService', { path1, path2 })
+      success = await rclone_api_exec_async('/sync/bisync', {
+        path1,
+        path2,
+        _resync: true,
+      })
+      if (!success) {
+        throw new Error(`Bidirectional sync failed: ${path1} <-> ${path2}`)
+      }
+    }
+  }
+}
 
 export { copyFile, copyDir, moveFile, moveDir, sync }