diff --git a/frontend/src/mock/index.ts b/frontend/src/mock/index.ts
index 35b3428..756e331 100644
--- a/frontend/src/mock/index.ts
+++ b/frontend/src/mock/index.ts
@@ -4,7 +4,9 @@
  * 样板阶段用于让每个页面都有内容可看。接真实后端时无需改这里。 */
 import * as D from './data'
 
-export const MOCK_ON = true
+// dev(npm run dev)=true 走 mock 假数据(本地无后端看原型)；build(vite build)=false 走真实后端。
+// 这样 NAS/生产 dist 自动真实，Mac 本地 dev 自动 mock。
+export const MOCK_ON = import.meta.env.DEV
 
 type Builder = (url: string) => unknown
 interface Route {
diff --git a/frontend/src/views/backtest/PortfolioBacktest.vue b/frontend/src/views/backtest/PortfolioBacktest.vue
index c58dd38..972eeb3 100644
--- a/frontend/src/views/backtest/PortfolioBacktest.vue
+++ b/frontend/src/views/backtest/PortfolioBacktest.vue
@@ -26,15 +26,39 @@ const errorMsg = ref('')
 const stageHint = ref('')
 let pollTimer: ReturnType<typeof setInterval> | null = null
 
+function loadDateRange(): { start: string; end: string } {
+  try {
+    const s = localStorage.getItem('portfolio_date_range')
+    if (s) return JSON.parse(s) as { start: string; end: string }
+  } catch {
+    /* ignore */
+  }
+  const end = new Date()
+  const start = new Date(end)
+  start.setFullYear(start.getFullYear() - 1)
+  const f = (d: Date): string => d.toISOString().slice(0, 10)
+  return { start: f(start), end: f(end) }
+}
+const dr = loadDateRange()
 const form = reactive({
   pool: 'hs300_subset',
   strategy: 'all_weather',
   max_pool: 30,
-  start: '2024-01-01',
-  end: '2024-02-29',
+  start: dr.start,
+  end: dr.end,
   cash: 1_000_000,
   benchmark: '000300.XSHG',
 })
+watch(
+  () => [form.start, form.end],
+  ([s, e]) => {
+    try {
+      localStorage.setItem('portfolio_date_range', JSON.stringify({ start: s, end: e }))
+    } catch {
+      /* ignore */
+    }
+  },
+)
 
 const poolOptions = [
   { label: 'HS300 子集(小范围验证)', value: 'hs300_subset' },