diff --git a/frontend/src/api/backtest.ts b/frontend/src/api/backtest.ts
index 1a7d899..e4ef2e5 100644
--- a/frontend/src/api/backtest.ts
+++ b/frontend/src/api/backtest.ts
@@ -6,6 +6,7 @@ export interface CtaSubmit {
   params: Record<string, unknown>
   start: string
   end: string
+  benchmark?: string
 }
 
 export interface TaskStatus {
diff --git a/frontend/src/views/backtest/New.vue b/frontend/src/views/backtest/New.vue
index 55f83e0..bbe7720 100644
--- a/frontend/src/views/backtest/New.vue
+++ b/frontend/src/views/backtest/New.vue
@@ -16,6 +16,7 @@ const form = reactive({
   symbol: '600000',
   start: '2024-01-01',
   end: '2024-06-30',
+  benchmark: 'hs300',
 })
 const paramValues = reactive<Record<string, string>>({})
 
@@ -65,6 +66,7 @@ async function onSubmit(): Promise<void> {
       params,
       start: form.start,
       end: form.end,
+      benchmark: form.benchmark,
     })
     ElMessage.success('回测已提交')
     router.push(`/backtest/progress/${tid}`)
@@ -103,6 +105,12 @@ async function onSubmit(): Promise<void> {
       <el-form-item label="结束日期">
         <el-date-picker v-model="form.end" type="date" value-format="YYYY-MM-DD" style="width: 220px" />
       </el-form-item>
+      <el-form-item label="基准">
+        <el-select v-model="form.benchmark" style="width: 220px">
+          <el-option label="沪深300 (hs300)" value="hs300" />
+          <el-option label="中证500 (zz500)" value="zz500" />
+        </el-select>
+      </el-form-item>
       <el-form-item>
         <el-button type="primary" :loading="submitting" @click="onSubmit">提交回测</el-button>
       </el-form-item>
diff --git a/sanguo_api/main.py b/sanguo_api/main.py
index 2a12440..ba81c35 100644
--- a/sanguo_api/main.py
+++ b/sanguo_api/main.py
@@ -72,6 +72,19 @@ def build_app(config_path: str = "config/backtest.yaml", static_dir: str | None
 
         app.mount("/", StaticFiles(directory=static_dir, html=True), name="spa")
 
+        # SPA history fallback: deep links like /backtest/result/:id hit StaticFiles
+        # (no such file) → 404. For browser navigation (Accept: text/html) serve
+        # index.html so vue-router can take over; API 404s (Accept: application/json)
+        # still return JSON. This makes refresh/bookmark of any SPA route work.
+        from starlette.exceptions import HTTPException as StarletteHTTPException
+        from starlette.responses import JSONResponse
+
+        @app.exception_handler(StarletteHTTPException)
+        async def _spa_fallback(request, exc):  # noqa: ANN001
+            if exc.status_code == 404 and "text/html" in request.headers.get("accept", ""):
+                return FileResponse(index_html)
+            return JSONResponse({"detail": exc.detail}, status_code=exc.status_code)
+
     return app