diff --git a/deploy/nginx/frontend.conf b/deploy/nginx/frontend.conf
index 670f1e7..9f11c26 100644
--- a/deploy/nginx/frontend.conf
+++ b/deploy/nginx/frontend.conf
@@ -10,9 +10,9 @@ server {
         try_files $uri $uri/ /index.html;
     }
 
-    # API 代理到后端
+    # API 代理到后端 (使用宿主机IP访问后端容器)
     location /api/ {
-        proxy_pass http://backend:8000/api/;
+        proxy_pass http://172.17.0.1:8000/api/;
         proxy_http_version 1.1;
         proxy_set_header Upgrade $http_upgrade;
         proxy_set_header Connection 'upgrade';