diff --git a/docs/development-standards.md b/docs/development-standards.md
index f71759e..97f88e2 100644
--- a/docs/development-standards.md
+++ b/docs/development-standards.md
@@ -345,8 +345,11 @@ const router = createBrowserRouter(routes, {
 
 **api.ts 中的 base URL 自动拼接：**
 ```typescript
-const APP_BASE_URL = '/app_03';   // 由环境变量 VITE_APP_BASE_URL 控制
-function joinPath(prefix: string, path: string) {
+const API_PREFIX = import.meta.env.VITE_API_PREFIX || "/api";
+// APP_BASE_URL = basename = 从 API_PREFIX 提取（"/app_03/api" → "/app_03"）
+const APP_BASE_URL = API_PREFIX.replace(/\/api\/?$/, '') || '/';
+
+function joinPrefix(prefix: string, path: string) {
   const p = prefix.endsWith('/') ? prefix.slice(0, -1) : prefix;
   const s = path.startsWith('/') ? path : `/${path}`;
   return `${p}${s}`;
@@ -354,6 +357,26 @@ function joinPath(prefix: string, path: string) {
 // 最终请求: /app_03/api/xxx
 ```
 
+**.env 配置：**
+```ini
+# API_PREFIX 必须带 basename，开发和 Nginx 代理一致
+VITE_API_PREFIX=/app_03/api
+```
+
+**Vite proxy 配置（开发环境）：**
+```typescript
+// vite.config.ts
+server: {
+  proxy: {
+    [apiPrefix]: {              // "/app_03/api"
+      target: 'http://localhost:8030',
+      changeOrigin: true,
+      rewrite: (path) => path.replace(/^\/app_03\/api/, '/api'),
+    },
+  },
+}
+```
+
 ---
 
 ## 四、后端规范
diff --git a/frontend/.env.example b/frontend/.env.example
index 1eb9564..e979412 100644
--- a/frontend/.env.example
+++ b/frontend/.env.example
@@ -1,3 +1,2 @@
 VITE_API_PREFIX=/app_03/api
 VITE_UPLOADS_PREFIX=/uploads
-
diff --git a/frontend/src/app/services/api.ts b/frontend/src/app/services/api.ts
index 7a5f8c9..8a90307 100644
--- a/frontend/src/app/services/api.ts
+++ b/frontend/src/app/services/api.ts
@@ -2,7 +2,8 @@ const TOKEN_KEY = "auth_token";
 
 const env = (import.meta as any).env || {};
 const API_PREFIX: string = (env.VITE_API_PREFIX as string) || "/api";
-const APP_BASE_URL: string = (env.BASE_URL as string) || "/";
+// APP_BASE_URL = basename = 从 API_PREFIX 提取（"/app_03/api" → "/app_03"）
+const APP_BASE_URL: string = API_PREFIX.replace(/\/api\/?$/, '') || '/';
 
 function joinPrefix(prefix: string, path: string) {
   const p = prefix.endsWith("/") ? prefix.slice(0, -1) : prefix;
diff --git a/frontend/vite.config.ts b/frontend/vite.config.ts
index fcac799..ac2d4fb 100644
--- a/frontend/vite.config.ts
+++ b/frontend/vite.config.ts
@@ -33,11 +33,12 @@ export default defineConfig(({ mode }) => {
       allowedHosts: ['.trycloudflare.com', '.loca.lt'],
       proxy: {
         [apiPrefix]: {
-          target: 'http://localhost:8000',
+          target: 'http://localhost:8030',
           changeOrigin: true,
+          rewrite: (path) => path.replace(/^\/app_03\/api/, '/api'),
         },
         [uploadsPrefix]: {
-          target: 'http://localhost:8000',
+          target: 'http://localhost:8030',
           changeOrigin: true,
         },
       },