diff --git a/backend/server.js b/backend/server.js
index 9e44035..698c0bd 100644
--- a/backend/server.js
+++ b/backend/server.js
@@ -3049,7 +3049,7 @@ app.get('/api/files/upload-signature', authMiddleware, async (req, res) => {
       if (currentUsed + fileSize > ossQuota) {
         return res.status(400).json({
           success: false,
-          message: 
+          message: "OSS 存储空间不足，已用 " + (currentUsed / 1024 / 1024 / 1024).toFixed(2) + "GB / " + (ossQuota / 1024 / 1024 / 1024).toFixed(2) + "GB"
         });
       }
     } catch (usageErr) {
@@ -3201,7 +3201,7 @@ app.get('/api/files/download-url', authMiddleware, async (req, res) => {
       if (currentUsed + fileSize > ossQuota) {
         return res.status(400).json({
           success: false,
-          message: 
+          message: "OSS 存储空间不足，已用 " + (currentUsed / 1024 / 1024 / 1024).toFixed(2) + "GB / " + (ossQuota / 1024 / 1024 / 1024).toFixed(2) + "GB"
         });
       }
     } catch (usageErr) {