diff --git a/vehicle-data-platform/apps/web/src/v2/pages/VehiclePage.test.tsx b/vehicle-data-platform/apps/web/src/v2/pages/VehiclePage.test.tsx
index 778e48e6..bb6ed4b9 100644
--- a/vehicle-data-platform/apps/web/src/v2/pages/VehiclePage.test.tsx
+++ b/vehicle-data-platform/apps/web/src/v2/pages/VehiclePage.test.tsx
@@ -89,6 +89,8 @@ test('polls lightweight single-vehicle realtime data and passes its report inter
   expect(commandCard?.querySelector('.v2-live-grid > div:nth-child(2)')).toHaveTextContent('SOC');
   expect(commandCard?.querySelector('.v2-live-grid > div:nth-child(4)')).toHaveTextContent('当日里程');
   expect(commandCard?.querySelector('.v2-live-grid > div:nth-child(5)')).toHaveTextContent('推荐来源JT/T 808');
+  expect(commandCard?.querySelector('.v2-live-primary-protocol')).toHaveClass('v2-protocol-tag', 'semi-tag-cyan-light');
+  expect(commandCard?.querySelector('.v2-identity-sources .v2-protocol-tag')).toHaveClass('semi-tag-cyan-light');
   expect(screen.getByLabelText('粤A12345 车辆档案')).toHaveFocus();
   expect(screen.getByText('扫描 0 帧 · 上海时间 10:00:00')).toBeInTheDocument();
   expect(screen.getByRole('heading', { name: '最新上报', level: 5 })).toBeInTheDocument();
@@ -117,6 +119,31 @@ test('polls lightweight single-vehicle realtime data and passes its report inter
   await waitFor(() => expect(sourceEvidence).toHaveBeenCalledTimes(1));
 });
 
+test('holds the vehicle identity at the top through late layout shifts and yields to deliberate scrolling', async () => {
+  vi.spyOn(api, 'vehicleDetail').mockResolvedValue(detail);
+  vi.spyOn(api, 'vehicleRealtime').mockResolvedValue({ items: [initialRealtime], total: 1, limit: 1, offset: 0 });
+  vi.spyOn(api, 'latestTelemetry').mockResolvedValue({ values: [], categories: [], scannedFrames: 0 } as never);
+  const client = new QueryClient({ defaultOptions: { queries: { retry: false } } });
+  const workspace = document.createElement('main');
+  workspace.className = 'v2-content';
+  document.body.appendChild(workspace);
+
+  render(<QueryClientProvider client={client}><MemoryRouter initialEntries={[`/vehicles/${initialRealtime.vin}`]} future={ROUTER_FUTURE}><Routes><Route path="/vehicles/:vin" element={<VehiclePage />} /></Routes></MemoryRouter></QueryClientProvider>, { container: workspace });
+
+  await screen.findByLabelText('粤A12345 车辆档案');
+  await new Promise((resolve) => window.setTimeout(resolve, 420));
+  workspace.scrollTop = 312;
+  fireEvent.scroll(workspace);
+  await waitFor(() => expect(workspace.scrollTop).toBe(0));
+
+  fireEvent.wheel(workspace);
+  workspace.scrollTop = 188;
+  fireEvent.scroll(workspace);
+  await new Promise((resolve) => window.setTimeout(resolve, 32));
+  expect(workspace.scrollTop).toBe(188);
+  workspace.remove();
+});
+
 test('uses the shared Semi empty recovery surface when a vehicle cannot be resolved', async () => {
   vi.spyOn(api, 'vehicleDetail').mockResolvedValue({ ...detail, lookupResolved: false });
   vi.spyOn(api, 'vehicleRealtime').mockResolvedValue({ items: [], total: 0, limit: 1, offset: 0 });
@@ -184,6 +211,7 @@ test('shows deduplicated Semi vehicle candidates and opens the selected VIN', as
   expect(view.container.querySelector('.v2-vehicle-directory-table.semi-table-wrapper')).toBeInTheDocument();
   expect(view.container.querySelector('.v2-vehicle-search-page')).toHaveClass('v2-vehicle-directory-v3');
   expect(view.container.querySelector('.v2-vehicle-directory-profile')).toHaveTextContent('测试品牌13800000000');
+  expect(view.container.querySelector('.v2-vehicle-directory-protocols .v2-protocol-tag')).toHaveClass('semi-tag-cyan-light');
   expect(view.container.querySelector('.v2-vehicle-discovery-shell')).toContainElement(screen.getByLabelText('查车操作'));
   expect(screen.getByRole('button', { name: `打开 ${initialRealtime.vin} 车辆档案` })).toBeInTheDocument();
   fireEvent.focus(input);
@@ -492,6 +520,9 @@ test('uses compact Semi telemetry evidence cards on mobile', async () => {
   expect(screen.getByRole('group', { name: '车辆快捷操作' })).toHaveTextContent('切换车辆轨迹回放历史数据里程查询告警事件');
   expect(document.querySelectorAll('.v2-identity-sources .semi-tag')).toHaveLength(3);
   expect(document.querySelector('.v2-identity-sources')).toHaveTextContent('GB/T 32960JT/T 808宇通 MQTT');
+  expect(document.querySelector('.v2-identity-sources .semi-tag-blue-light')).toHaveTextContent('GB/T 32960');
+  expect(document.querySelector('.v2-identity-sources .semi-tag-cyan-light')).toHaveTextContent('JT/T 808');
+  expect(document.querySelector('.v2-identity-sources .semi-tag-violet-light')).toHaveTextContent('宇通 MQTT');
   expect(document.querySelector('.v2-vehicle-command-card .v2-live-grid')).toHaveAttribute('aria-label', '车辆实时指标');
   expect(document.querySelectorAll('.v2-vehicle-command-card .v2-live-grid > [role="listitem"]')).toHaveLength(6);
   expect(document.querySelector('.v2-live-metric.is-speed')).toHaveTextContent('速度');
diff --git a/vehicle-data-platform/apps/web/src/v2/pages/VehiclePage.tsx b/vehicle-data-platform/apps/web/src/v2/pages/VehiclePage.tsx
index 614a32e1..6fb9ba15 100644
--- a/vehicle-data-platform/apps/web/src/v2/pages/VehiclePage.tsx
+++ b/vehicle-data-platform/apps/web/src/v2/pages/VehiclePage.tsx
@@ -19,6 +19,7 @@ import { FleetMap } from '../map/FleetMap';
 import { InlineError, PageLoading } from '../shared/AsyncState';
 import { MonitorReturnBar } from '../shared/MonitorReturnBar';
 import { PlatformTime } from '../shared/PlatformTime';
+import { ProtocolTag } from '../shared/ProtocolTag';
 import { SegmentedTabs } from '../shared/SegmentedTabs';
 import { VehicleSourceEvidencePanel } from '../shared/VehicleSourceEvidencePanel';
 import { WorkspaceCommandBar } from '../shared/WorkspaceCommandBar';
@@ -223,7 +224,7 @@ function TelemetryTimeCell({ item }: { item: LatestTelemetryValue }) {
 }
 
 function TelemetrySourceCell({ item }: { item: LatestTelemetryValue }) {
-  return <div className="v2-telemetry-source"><Tag color="blue" type="light" size="small">{protocolDisplayLabel(item.protocol)}</Tag><small title={item.sourceEndpoint}>{item.sourceEndpoint || '协议默认来源'}</small></div>;
+  return <div className="v2-telemetry-source"><ProtocolTag protocol={item.protocol} compact /><small title={item.sourceEndpoint}>{item.sourceEndpoint || '协议默认来源'}</small></div>;
 }
 
 function telemetryRowKey(item?: LatestTelemetryValue) {
@@ -431,27 +432,41 @@ function VehicleRecord({ detail, liveRealtime, telemetry, telemetryPending, tele
   useLayoutEffect(() => {
     const root = recordRootRef.current;
     if (!root) return;
-    let cancelled = false;
+    const scrollOwner = root.closest<HTMLElement>('.v2-content') ?? document.querySelector<HTMLElement>('.v2-content');
+    let active = true;
+    let resetFrame = 0;
     const timers: number[] = [];
     const revealIdentity = () => {
-      if (!cancelled) revealVehicleIdentity(root);
+      if (active) revealVehicleIdentity(root);
     };
-    const cancelEntryReset = () => {
-      cancelled = true;
+    const stopEntryGuard = () => {
+      if (!active) return;
+      active = false;
+      window.cancelAnimationFrame(resetFrame);
       for (const timer of timers) window.clearTimeout(timer);
+      resizeObserver?.disconnect();
+      scrollOwner?.removeEventListener('scroll', restoreEntryPosition);
+      for (const eventName of interactionEvents) window.removeEventListener(eventName, stopEntryGuard, true);
+    };
+    const restoreEntryPosition = () => {
+      if (!active || !scrollOwner || scrollOwner.scrollTop === 0) return;
+      window.cancelAnimationFrame(resetFrame);
+      resetFrame = window.requestAnimationFrame(revealIdentity);
     };
     const interactionEvents = ['wheel', 'touchstart', 'pointerdown', 'keydown'] as const;
-    for (const eventName of interactionEvents) window.addEventListener(eventName, cancelEntryReset, { capture: true, passive: true });
+    for (const eventName of interactionEvents) window.addEventListener(eventName, stopEntryGuard, { capture: true, passive: true });
+    scrollOwner?.addEventListener('scroll', restoreEntryPosition, { passive: true });
+    const resizeObserver = typeof ResizeObserver === 'undefined' ? undefined : new ResizeObserver(revealIdentity);
+    resizeObserver?.observe(root);
     revealIdentity();
     const frame = window.requestAnimationFrame(revealIdentity);
-    // The map and live evidence arrive independently. Keep the identity band
-    // anchored only during initial settlement, then immediately yield to input.
-    for (const delay of [80, 180, 360, 720, 1200, 1800, 2400]) timers.push(window.setTimeout(revealIdentity, delay));
+    // Map tiles, source evidence and live data settle independently. Guard the
+    // first viewport through those late layout changes, but yield immediately
+    // as soon as the user starts scrolling or interacting.
+    for (const delay of [80, 180, 360, 720, 1200, 1800, 2400, 3600, 5200]) timers.push(window.setTimeout(revealIdentity, delay));
     return () => {
-      cancelled = true;
       window.cancelAnimationFrame(frame);
-      for (const timer of timers) window.clearTimeout(timer);
-      for (const eventName of interactionEvents) window.removeEventListener(eventName, cancelEntryReset, true);
+      stopEntryGuard();
     };
   }, [detail.vin]);
   return <div ref={recordRootRef} className={`v2-vehicle-record-page v2-vehicle-record-v3${mobileLayout ? ' is-mobile-layout' : ''}`} tabIndex={-1} aria-label={`${fmt(identity?.plate || realtime?.plate)} 车辆档案`}>
@@ -467,7 +482,7 @@ function VehicleRecord({ detail, liveRealtime, telemetry, telemetryPending, tele
         description={<span className="v2-identity-vin"><small>VIN</small><b>{detail.vin}</b><Button theme="borderless" aria-label="复制 VIN" title="复制 VIN" icon={<IconCopy />} onClick={() => navigator.clipboard?.writeText(detail.vin)} /></span>}
         meta={<span className="v2-identity-meta">
           <span className="v2-identity-model"><small>车辆品牌 / 车型</small><strong>{[detail.profile?.brandName, detail.profile?.modelName].filter(Boolean).join(' / ') || fmt(identity?.oem || realtime?.oem)}</strong></span>
-          <span className="v2-identity-source-context"><small>可用数据来源</small><span className="v2-identity-sources">{detail.sources.length ? detail.sources.map((source) => <Tag key={source} color="blue" type="light" size="small">{protocolDisplayLabel(source)}</Tag>) : <Tag color="grey" type="light" size="small">暂无来源</Tag>}</span></span>
+          <span className="v2-identity-source-context"><small>可用数据来源</small><span className="v2-identity-sources">{detail.sources.length ? detail.sources.map((source) => <ProtocolTag key={source} protocol={source} compact />) : <Tag color="grey" type="light" size="small">暂无来源</Tag>}</span></span>
         </span>}
         actions={<div className="v2-identity-actions" role="group" aria-label="车辆快捷操作">
           {actions.map((action) => <Button key={action.key} theme="light" type={action.type} icon={action.icon} aria-label={action.label} onClick={() => navigate(action.to)}>{action.label}</Button>)}
@@ -484,7 +499,7 @@ function VehicleRecord({ detail, liveRealtime, telemetry, telemetryPending, tele
           <div className="v2-live-metric is-soc" role="listitem"><small>SOC</small><strong>{availableMetric(realtime?.socPercent, realtime?.socAvailable)}<em>%</em></strong><span>剩余电量</span></div>
           <div className="v2-live-metric is-mileage" role="listitem"><small>总里程</small><Button theme="borderless" type="tertiary" className="v2-live-source-link" title="展开全部里程来源" aria-label="查看总里程全部来源" onClick={() => setSourceEvidenceOpen(true)}><span>{availableMetric(realtime?.totalMileageKm, realtime?.mileageAvailable)}<em>km</em></span><IconChevronRight /></Button><span>推荐口径</span></div>
           <div className="v2-live-metric is-today-mileage" role="listitem"><small>当日里程</small><Button theme="borderless" type="tertiary" className="v2-live-source-link" title="展开全部里程来源" aria-label="查看当日里程全部来源" onClick={() => setSourceEvidenceOpen(true)}><span>{availableMetric(realtime?.todayMileageKm, realtime?.todayMileageAvailable)}<em>km</em></span><IconChevronRight /></Button><span>今日累计</span></div>
-          <div className="v2-live-metric is-source" role="listitem"><small>推荐来源</small><strong className="is-text" title={realtime?.primaryProtocol}>{protocolDisplayLabel(realtime?.primaryProtocol)}</strong><span title={realtime?.locationSource}>{protocolSourceLabel(realtime?.locationSource) || '当前最优来源'}</span></div>
+          <div className="v2-live-metric is-source" role="listitem"><small>推荐来源</small><ProtocolTag protocol={realtime?.primaryProtocol} className="v2-live-primary-protocol" /><span title={realtime?.locationSource}>{protocolSourceLabel(realtime?.locationSource) || '当前最优来源'}</span></div>
           <div className="v2-live-metric is-source-status" role="listitem"><small>来源状态</small><strong>{realtime?.onlineSourceCount ?? 0}<em> / {detail.sourceStatus.length}</em></strong><span>在线来源 / 全部</span></div>
         </div>
         <CurrentVehicleAddress vehicle={realtime} fallback={identity?.locationText} />
diff --git a/vehicle-data-platform/apps/web/src/v2/pages/VehicleSearchWorkspace.tsx b/vehicle-data-platform/apps/web/src/v2/pages/VehicleSearchWorkspace.tsx
index 33c56ccb..9dd57b74 100644
--- a/vehicle-data-platform/apps/web/src/v2/pages/VehicleSearchWorkspace.tsx
+++ b/vehicle-data-platform/apps/web/src/v2/pages/VehicleSearchWorkspace.tsx
@@ -8,9 +8,9 @@ import type { Page, VehicleCoverageRow } from '../../api/types';
 import { usePlatformSession } from '../auth/AuthGate';
 import { canAdminister } from '../auth/session';
 import { formatZhNumber } from '../domain/formatters';
-import { protocolDisplayLabel } from '../domain/protocols';
 import { useMobileLayout } from '../hooks/useMobileLayout';
 import { QUERY_MEMORY, queryScopeKey, retainPreviousPageWithinScope } from '../queryPolicy';
+import { ProtocolTag } from '../shared/ProtocolTag';
 import { TablePagination } from '../shared/TablePagination';
 import { VehicleCandidateList } from '../shared/VehicleCandidateList';
 import { mergeVehicleCandidates } from '../shared/vehicleCandidates';
@@ -194,7 +194,7 @@ export default function VehicleSearchWorkspace() {
                     <Tag color={vehicle.online ? 'green' : 'grey'} type="light" size="small">{vehicle.online ? '在线' : '离线'}</Tag>
                     <small>{vehicleLastSeenLabel(vehicle.lastSeen)}</small>
                   </span>
-                  <span className="v2-vehicle-recent-protocols">{vehicle.protocols.slice(0, 2).map((protocol) => <Tag key={protocol} color="blue" type="light" size="small">{protocolDisplayLabel(protocol)}</Tag>)}</span>
+                  <span className="v2-vehicle-recent-protocols">{vehicle.protocols.slice(0, 2).map((protocol) => <ProtocolTag key={protocol} protocol={protocol} compact />)}</span>
                   <IconChevronRight className="v2-vehicle-recent-arrow" />
                 </Button>
               </div>)}
@@ -222,7 +222,7 @@ export default function VehicleSearchWorkspace() {
                 {
                   title: '协议来源',
                   dataIndex: 'protocols',
-                  render: (protocols: string[]) => <span className="v2-vehicle-directory-protocols">{protocols.length ? protocols.slice(0, 3).map((protocol) => <Tag key={protocol} color="blue" type="light" size="small">{protocolDisplayLabel(protocol)}</Tag>) : <span>暂无来源</span>}</span>
+                  render: (protocols: string[]) => <span className="v2-vehicle-directory-protocols">{protocols.length ? protocols.slice(0, 3).map((protocol) => <ProtocolTag key={protocol} protocol={protocol} compact />) : <span>暂无来源</span>}</span>
                 },
                 {
                   title: '',
diff --git a/vehicle-data-platform/apps/web/src/v2/shared/VehicleCandidateList.test.tsx b/vehicle-data-platform/apps/web/src/v2/shared/VehicleCandidateList.test.tsx
index 4b5c4f4b..1c3171a3 100644
--- a/vehicle-data-platform/apps/web/src/v2/shared/VehicleCandidateList.test.tsx
+++ b/vehicle-data-platform/apps/web/src/v2/shared/VehicleCandidateList.test.tsx
@@ -27,6 +27,8 @@ test('renders consistent Semi vehicle options and keeps plate first', () => {
   const option = screen.getByRole('option', { name: '粤A00001 VIN001 GB/T 32960 JT/T 808 选择' });
   expect(option).toHaveClass('semi-button', 'v2-vehicle-option');
   expect(option).toHaveTextContent('粤A00001VIN001GB/T 32960JT/T 808选择');
+  expect(option.querySelector('.semi-tag-blue-light')).toHaveTextContent('GB/T 32960');
+  expect(option.querySelector('.semi-tag-cyan-light')).toHaveTextContent('JT/T 808');
   expect(screen.getByRole('option', { name: '粤A00002 VIN002 JT/T 808 已分配' })).toHaveAttribute('aria-selected', 'true');
 
   fireEvent.click(option);
diff --git a/vehicle-data-platform/apps/web/src/v2/shared/VehicleCandidateList.tsx b/vehicle-data-platform/apps/web/src/v2/shared/VehicleCandidateList.tsx
index 73ea5d21..abf79d16 100644
--- a/vehicle-data-platform/apps/web/src/v2/shared/VehicleCandidateList.tsx
+++ b/vehicle-data-platform/apps/web/src/v2/shared/VehicleCandidateList.tsx
@@ -1,6 +1,7 @@
 import { Button, Spin, Tag } from '@douyinfe/semi-ui';
 import type { ReactNode } from 'react';
 import { protocolDisplayLabel } from '../domain/protocols';
+import { ProtocolTag } from './ProtocolTag';
 import { VehicleOptionError } from './VehicleOptionError';
 
 export interface VehicleCandidateItem {
@@ -75,7 +76,7 @@ export function VehicleCandidateList<T extends VehicleCandidateItem>({
           <strong>{vehicle.plate || '未绑定车牌'}</strong>
           <small>{vehicle.vin}</small>
         </span>
-        {protocols.length ? <span className="v2-vehicle-option-protocols">{protocols.slice(0, 3).map((protocol) => <Tag key={protocol} color="grey" type="light" size="small">{protocolDisplayLabel(protocol)}</Tag>)}</span> : null}
+        {protocols.length ? <span className="v2-vehicle-option-protocols">{protocols.slice(0, 3).map((protocol) => <ProtocolTag key={protocol} protocol={protocol} compact />)}</span> : null}
         <Tag className="v2-vehicle-option-action" color={selected ? 'blue' : 'grey'} type="light" size="small">{label}</Tag>
       </Button>;
     }) : null}
diff --git a/vehicle-data-platform/apps/web/src/v2/styles/workspace.css b/vehicle-data-platform/apps/web/src/v2/styles/workspace.css
index c98221c4..722ae7f7 100644
--- a/vehicle-data-platform/apps/web/src/v2/styles/workspace.css
+++ b/vehicle-data-platform/apps/web/src/v2/styles/workspace.css
@@ -6513,6 +6513,14 @@
   letter-spacing: 0;
 }
 
+.v2-vehicle-command-card .v2-live-primary-protocol.semi-tag {
+  min-height: 24px;
+  margin: 7px 0 0;
+  border-radius: 7px;
+  padding-inline: 8px;
+  font-size: 10px;
+}
+
 .v2-vehicle-command-card .v2-live-source-link .semi-button-content {
   display: flex;
   min-width: 0;