diff --git a/backend/server.js b/backend/server.js
index 389648f..6121a3e 100644
--- a/backend/server.js
+++ b/backend/server.js
@@ -1346,8 +1346,6 @@ app.post('/api/share/:code/verify', async (req, res) => {
         responseData.file = shareFileCache.get(code);
       } else {
         // 缓存未命中，查询存储
-        const storageType = share.storage_type || 'sftp';
-        console.log(`[缓存未命中] 分享码: ${code}，存储类型: ${storageType}`);
         try {
           // 获取分享者的用户信息
           const shareOwner = UserDB.findById(share.user_id);
@@ -1355,6 +1353,10 @@ app.post('/api/share/:code/verify', async (req, res) => {
             throw new Error('分享者不存在');
           }
 
+          // 使用分享者当前的存储类型（而不是分享创建时的存储类型）
+          const storageType = shareOwner.current_storage_type || 'sftp';
+          console.log(`[缓存未命中] 分享码: ${code}，存储类型: ${storageType} (分享者当前)`);
+
           // 使用统一存储接口
           const { StorageInterface } = require('./storage');
           const userForStorage = {
@@ -1409,7 +1411,7 @@ app.post('/api/share/:code/verify', async (req, res) => {
           const httpBaseUrl = share.http_download_base_url || '';
           const baseUrl = httpBaseUrl ? httpBaseUrl.replace(/\/+$/, '') : '';
           const normalizedFilePath = filePath.startsWith('/') ? filePath : `/${filePath}`;
-          const storageType = share.storage_type || 'sftp';
+          const storageType = shareOwner.current_storage_type || 'sftp';
           const httpDownloadUrl = (storageType === 'sftp' && baseUrl) ? `${baseUrl}${normalizedFilePath}` : null;
 
           responseData.file = {
@@ -1472,8 +1474,8 @@ app.post('/api/share/:code/list', async (req, res) => {
 
     // 使用统一存储接口，根据分享的storage_type选择存储后端
     const { StorageInterface } = require('./storage');
-    const storageType = share.storage_type || 'sftp';
-    console.log(`[分享列表] 存储类型: ${storageType}, 分享路径: ${share.share_path}`);
+    const storageType = shareOwner.current_storage_type || 'sftp';
+    console.log(`[分享列表] 存储类型: ${storageType} (分享者当前), 分享路径: ${share.share_path}`);
 
     // 临时构造用户对象以使用存储接口
     const userForStorage = {
@@ -1657,8 +1659,8 @@ app.get('/api/share/:code/download-file', async (req, res) => {
 
     // 使用统一存储接口，根据分享的storage_type选择存储后端
     const { StorageInterface } = require('./storage');
-    const storageType = share.storage_type || 'sftp';
-    console.log(`[分享下载] 存储类型: ${storageType}, 文件路径: ${filePath}`);
+    const storageType = shareOwner.current_storage_type || 'sftp';
+    console.log(`[分享下载] 存储类型: ${storageType} (分享者当前), 文件路径: ${filePath}`);
 
     // 临时构造用户对象以使用存储接口
     const userForStorage = {