diff --git a/README.md b/README.md
index c51db3c..c36d8af 100644
--- a/README.md
+++ b/README.md
@@ -18,6 +18,8 @@ npm run remote:dev
 
 首次启动时填写配置请求地址和部署 Key，系统自动写入被 Git 忽略的本机配置并重启后端。保存一次性显示的管理员账号和密码后直接登录，不需要在本地创建数据库或继续执行设置向导。前端默认访问 http://localhost:5173，API 默认代理到本地后端。
 
+拉取主仓库更新后必须停止旧的 `npm run remote:dev` 进程并重新启动，保证前后端使用同一版本。MKH 页的强制刷新带有版本协议校验；如果新前端仍代理到未重启的旧后端，页面会停止展示可能过期的库存并明确提示重启，不再将旧值冒充为“最新数据”。
+
 ## 验证与构建
 
 ```bash
diff --git a/backend/src/services/mkhBomService.js b/backend/src/services/mkhBomService.js
index 3ea8996..f585725 100644
--- a/backend/src/services/mkhBomService.js
+++ b/backend/src/services/mkhBomService.js
@@ -2271,6 +2271,10 @@ async function getMkhBomList(query = {}) {
     saleWindowDays: SALE_WINDOW_DAYS,
     dataMode: preferLiveData ? 'live' : 'snapshot',
     refreshedAt: new Date().toISOString(),
+    // 前后端实时刷新协议。本地前端如果代理到未重启的旧后端，
+    // 将拒绝展示其返回的旧库存，而不是把缺失协议字段当成刷新成功。
+    freshDataContractVersion: 1,
+    freshDataApplied: forceFresh && operationalRefreshedAt > 0,
     operationalRefreshedAt: operationalRefreshedAt
       ? new Date(operationalRefreshedAt).toISOString()
       : null,
diff --git a/frontend/src/pages/MkhBomData/index.jsx b/frontend/src/pages/MkhBomData/index.jsx
index 46ebc7a..56e7043 100644
--- a/frontend/src/pages/MkhBomData/index.jsx
+++ b/frontend/src/pages/MkhBomData/index.jsx
@@ -18,6 +18,7 @@ import {
   syncMkhBom,
 } from '../../api/mkhBom';
 import { createRequestGate } from '../../utils/requestGate';
+import { requireMkhFreshContract } from '../../utils/mkhFreshContract';
 import { exportTableFile } from '../../utils/tableExport';
 import './style.css';
 
@@ -382,7 +383,14 @@ const MkhBomData = () => {
         setError(result?.error || '加载 MKH-BOM 资料失败');
         return;
       }
-      setData(result?.data || { rows: [], total: 0, page: 1, pageSize: 50 });
+      const snapshot = result?.data || null;
+      try {
+        requireMkhFreshContract(snapshot, { requireApplied: forceFresh });
+      } catch (contractError) {
+        setData({ rows: [], total: 0, page: 1, pageSize: 50, bomReady: false });
+        throw contractError;
+      }
+      setData(snapshot);
       if (forceFresh) lastListRefreshAtRef.current = Date.now();
       setError('');
     } catch (requestError) {
@@ -908,7 +916,7 @@ const MkhBomData = () => {
       if (!result || result.success === false || !result?.data?.snapshot) {
         throw new Error(result?.error || '同步接口未返回数据库快照');
       }
-      setData(result.data.snapshot);
+      setData(requireMkhFreshContract(result.data.snapshot));
       setError('');
       message.success('已实时读取最新订单、库存、BOM 与仓位数据');
     } catch (syncError) {
diff --git a/frontend/src/utils/mkhFreshContract.js b/frontend/src/utils/mkhFreshContract.js
new file mode 100644
index 0000000..2ba828d
--- /dev/null
+++ b/frontend/src/utils/mkhFreshContract.js
@@ -0,0 +1,15 @@
+export const MKH_FRESH_DATA_CONTRACT_VERSION = 1;
+
+const OUTDATED_BACKEND_MESSAGE = '本地后端版本过旧或更新后未重启，已停止展示可能过期的库存。'
+  + '请停止当前 npm run remote:dev，拉取最新 main 后重新启动。';
+
+export function requireMkhFreshContract(snapshot, { requireApplied = false } = {}) {
+  const contractVersion = Number(snapshot?.freshDataContractVersion) || 0;
+  if (contractVersion < MKH_FRESH_DATA_CONTRACT_VERSION) {
+    throw new Error(OUTDATED_BACKEND_MESSAGE);
+  }
+  if (requireApplied && snapshot?.freshDataApplied !== true) {
+    throw new Error('后端未确认已重读最新运营数据，已停止展示可能过期的库存，请重试。');
+  }
+  return snapshot;
+}
diff --git a/frontend/test/mkhFreshContract.test.mjs b/frontend/test/mkhFreshContract.test.mjs
new file mode 100644
index 0000000..261f79d
--- /dev/null
+++ b/frontend/test/mkhFreshContract.test.mjs
@@ -0,0 +1,23 @@
+import test from 'node:test';
+import assert from 'node:assert/strict';
+
+import { requireMkhFreshContract } from '../src/utils/mkhFreshContract.js';
+
+test('MKH fresh contract accepts a backend-confirmed live refresh', () => {
+  const snapshot = { freshDataContractVersion: 1, freshDataApplied: true };
+  assert.equal(requireMkhFreshContract(snapshot, { requireApplied: true }), snapshot);
+});
+
+test('MKH fresh contract rejects an outdated local backend instead of showing stale stock', () => {
+  assert.throws(
+    () => requireMkhFreshContract({ rows: [{ stock: 4 }] }, { requireApplied: true }),
+    /本地后端版本过旧/
+  );
+});
+
+test('MKH fresh contract requires explicit refresh completion for fresh requests', () => {
+  assert.throws(
+    () => requireMkhFreshContract({ freshDataContractVersion: 1 }, { requireApplied: true }),
+    /未确认已重读/
+  );
+});