diff --git a/vehicle-data-platform/apps/web/src/App.tsx b/vehicle-data-platform/apps/web/src/App.tsx
index 4478e07a..b5372ca0 100644
--- a/vehicle-data-platform/apps/web/src/App.tsx
+++ b/vehicle-data-platform/apps/web/src/App.tsx
@@ -17,6 +17,7 @@ export default function App() {
   const [activePage, setActivePage] = useState<PageKey>(initialRoute.page ?? 'dashboard');
   const [activeVin, setActiveVin] = useState(initialVehicleKey);
   const [analysisVin, setAnalysisVin] = useState(initialVehicleKey);
+  const [activeProtocol, setActiveProtocol] = useState(initialRoute.protocol ?? '');
   const [linkIssueCount, setLinkIssueCount] = useState<number | null>(null);
 
   const refreshOpsHealth = useCallback((showError = true) => {
@@ -55,13 +56,14 @@ export default function App() {
           setAnalysisVin(route.keyword);
         }
       }
+      setActiveProtocol(route.protocol ?? '');
     };
     window.addEventListener('hashchange', applyHashRoute);
     return () => window.removeEventListener('hashchange', applyHashRoute);
   }, []);
 
-  const replaceHash = (page: PageKey, keyword?: string) => {
-    const nextHash = buildAppHash({ page, keyword });
+  const replaceHash = (page: PageKey, keyword?: string, protocol?: string) => {
+    const nextHash = buildAppHash({ page, keyword, protocol });
     if (window.location.hash !== nextHash) {
       window.history.replaceState(null, '', nextHash);
     }
@@ -70,11 +72,11 @@ export default function App() {
   const navigatePage = (page: PageKey) => {
     setActivePage(page);
     if (page === 'detail') {
-      replaceHash(page, activeVin);
+      replaceHash(page, activeVin, activeProtocol);
       return;
     }
     if (page === 'history' || page === 'mileage') {
-      replaceHash(page, analysisVin);
+      replaceHash(page, analysisVin, activeProtocol);
       return;
     }
     replaceHash(page);
@@ -89,6 +91,7 @@ export default function App() {
       const resolved = await api.vehicleResolve(new URLSearchParams({ keyword: lookupKey }));
       const nextKey = resolved.resolved && resolved.vin ? resolved.vin : lookupKey;
       setActiveVin(nextKey);
+      setActiveProtocol('');
       setActivePage('detail');
       replaceHash('detail', nextKey);
       if (!resolved.resolved) {
@@ -106,7 +109,7 @@ export default function App() {
     }
     setAnalysisVin(nextVin);
     setActivePage('history');
-    replaceHash('history', nextVin);
+    replaceHash('history', nextVin, activeProtocol);
   };
 
   const openMileageForVehicle = (vin: string) => {
@@ -116,14 +119,25 @@ export default function App() {
     }
     setAnalysisVin(nextVin);
     setActivePage('mileage');
-    replaceHash('mileage', nextVin);
+    replaceHash('mileage', nextVin, activeProtocol);
+  };
+
+  const updateVehicleDetailQuery = (keyword: string, protocol?: string) => {
+    const nextKeyword = keyword.trim();
+    const nextProtocol = protocol?.trim() ?? '';
+    if (!nextKeyword) {
+      return;
+    }
+    setActiveVin(nextKeyword);
+    setActiveProtocol(nextProtocol);
+    replaceHash('detail', nextKeyword, nextProtocol);
   };
 
   const pages: Record<PageKey, JSX.Element> = {
     dashboard: <Dashboard onOpenVehicle={openVehicle} onOpenQuality={() => navigatePage('quality')} />,
     vehicles: <Vehicles onOpenVehicle={openVehicle} />,
     realtime: <Realtime onOpenVehicle={openVehicle} />,
-    detail: <VehicleDetail vin={activeVin} onOpenHistory={openHistoryForVehicle} onOpenMileage={openMileageForVehicle} />,
+    detail: <VehicleDetail vin={activeVin} protocol={activeProtocol} onOpenHistory={openHistoryForVehicle} onOpenMileage={openMileageForVehicle} onQueryChange={updateVehicleDetailQuery} />,
     history: <History initialVin={analysisVin} onOpenVehicle={openVehicle} />,
     mileage: <Mileage initialVin={analysisVin} onOpenVehicle={openVehicle} />,
     quality: <Quality onOpenVehicle={openVehicle} onHealthLoaded={(health) => setLinkIssueCount(health.linkHealth.filter((item) => item.status !== 'ok').length)} />
diff --git a/vehicle-data-platform/apps/web/src/domain/appRoute.test.ts b/vehicle-data-platform/apps/web/src/domain/appRoute.test.ts
index 967cc7bf..5ce41ec4 100644
--- a/vehicle-data-platform/apps/web/src/domain/appRoute.test.ts
+++ b/vehicle-data-platform/apps/web/src/domain/appRoute.test.ts
@@ -3,9 +3,10 @@ import { buildAppHash, parseAppHash } from './appRoute';
 
 describe('parseAppHash', () => {
   test('parses detail page keyword from hash query', () => {
-    expect(parseAppHash('#/detail?keyword=%E7%B2%A4AG18312')).toEqual({
+    expect(parseAppHash('#/detail?keyword=%E7%B2%A4AG18312&protocol=JT808')).toEqual({
       page: 'detail',
-      keyword: '粤AG18312'
+      keyword: '粤AG18312',
+      protocol: 'JT808'
     });
   });
 
@@ -16,7 +17,7 @@ describe('parseAppHash', () => {
 
 describe('buildAppHash', () => {
   test('builds shareable vehicle page hash with encoded keyword', () => {
-    expect(buildAppHash({ page: 'history', keyword: '粤AG18312' })).toBe('#/history?keyword=%E7%B2%A4AG18312');
+    expect(buildAppHash({ page: 'history', keyword: '粤AG18312', protocol: 'GB32960' })).toBe('#/history?keyword=%E7%B2%A4AG18312&protocol=GB32960');
   });
 
   test('builds page-only hash when keyword is empty', () => {
diff --git a/vehicle-data-platform/apps/web/src/domain/appRoute.ts b/vehicle-data-platform/apps/web/src/domain/appRoute.ts
index a7bb4bf6..ab2060a5 100644
--- a/vehicle-data-platform/apps/web/src/domain/appRoute.ts
+++ b/vehicle-data-platform/apps/web/src/domain/appRoute.ts
@@ -5,6 +5,7 @@ const pageKeys = new Set<PageKey>(['dashboard', 'vehicles', 'realtime', 'detail'
 export type AppRoute = {
   page?: PageKey;
   keyword?: string;
+  protocol?: string;
 };
 
 export function parseAppHash(hash: string): AppRoute {
@@ -18,7 +19,8 @@ export function parseAppHash(hash: string): AppRoute {
   }
   const params = new URLSearchParams(queryPart);
   const keyword = params.get('keyword')?.trim() || undefined;
-  return { page: pagePart as PageKey, keyword };
+  const protocol = params.get('protocol')?.trim() || undefined;
+  return { page: pagePart as PageKey, keyword, protocol };
 }
 
 export function buildAppHash(route: AppRoute): string {
@@ -28,6 +30,10 @@ export function buildAppHash(route: AppRoute): string {
   if (keyword) {
     params.set('keyword', keyword);
   }
+  const protocol = route.protocol?.trim();
+  if (protocol) {
+    params.set('protocol', protocol);
+  }
   const query = params.toString();
   return query ? `#/${page}?${query}` : `#/${page}`;
 }
diff --git a/vehicle-data-platform/apps/web/src/pages/VehicleDetail.tsx b/vehicle-data-platform/apps/web/src/pages/VehicleDetail.tsx
index 28f4efff..def22c78 100644
--- a/vehicle-data-platform/apps/web/src/pages/VehicleDetail.tsx
+++ b/vehicle-data-platform/apps/web/src/pages/VehicleDetail.tsx
@@ -21,14 +21,18 @@ const sourceCapabilities: Array<{ key: keyof Pick<VehicleSourceStatus, 'hasRealt
 
 export function VehicleDetail({
   vin,
+  protocol,
   onOpenHistory,
-  onOpenMileage
+  onOpenMileage,
+  onQueryChange
 }: {
   vin: string;
+  protocol?: string;
   onOpenHistory: (vin: string) => void;
   onOpenMileage: (vin: string) => void;
+  onQueryChange?: (keyword: string, protocol?: string) => void;
 }) {
-  const [query, setQuery] = useState<VehicleQuery>({ keyword: vin });
+  const [query, setQuery] = useState<VehicleQuery>({ keyword: vin, protocol });
   const [detail, setDetail] = useState<VehicleDetailData | null>(null);
   const [loading, setLoading] = useState(false);
   const requestSeq = useRef(0);
@@ -65,10 +69,10 @@ export function VehicleDetail({
   };
 
   useEffect(() => {
-    const nextQuery = { keyword: vin };
+    const nextQuery = { keyword: vin, protocol };
     setQuery(nextQuery);
     load(nextQuery);
-  }, [vin]);
+  }, [vin, protocol]);
 
   const identity = detail?.identity;
   const summary = detail?.realtimeSummary;
@@ -107,6 +111,7 @@ export function VehicleDetail({
         <Form key={formKey} initValues={query} layout="horizontal" onSubmit={(values) => {
           const nextQuery = { keyword: String(values.keyword ?? ''), protocol: String(values.protocol ?? '') };
           setQuery(nextQuery);
+          onQueryChange?.(nextQuery.keyword, nextQuery.protocol);
           load(nextQuery);
         }}>
           <Form.Input field="keyword" label="车辆关键词" placeholder="VIN / 车牌 / 手机号" style={{ width: 280 }} />