diff --git a/frontend/mobile-app/lib/core/network/api_client.dart b/frontend/mobile-app/lib/core/network/api_client.dart
index 30c6ff6c..10a87b45 100644
--- a/frontend/mobile-app/lib/core/network/api_client.dart
+++ b/frontend/mobile-app/lib/core/network/api_client.dart
@@ -127,7 +127,9 @@ class ApiClient {
       );
 
       if (response.statusCode == 200) {
-        final data = response.data;
+        final responseData = response.data;
+        // API 返回格式: { success: true, data: { accessToken, refreshToken, ... } }
+        final data = responseData['data'] as Map<String, dynamic>;
         await _secureStorage.write(
           key: StorageKeys.accessToken,
           value: data['accessToken'],
@@ -136,6 +138,7 @@ class ApiClient {
           key: StorageKeys.refreshToken,
           value: data['refreshToken'],
         );
+        debugPrint('Token refreshed successfully');
         return true;
       }
     } catch (e) {