diff --git a/src/components/explain/ExplainHallSelect.vue b/src/components/explain/ExplainHallSelect.vue
index 4db87e0..b7c22ee 100644
--- a/src/components/explain/ExplainHallSelect.vue
+++ b/src/components/explain/ExplainHallSelect.vue
@@ -1,6 +1,6 @@
 <template>
   <view class="explain-hall-select" :class="{ 'host-navigation': shouldUseHostNavigation }">
-    <view v-if="!shouldUseHostNavigation" class="explain-page-header">
+    <view v-if="showInternalHeader" class="explain-page-header">
       <view class="header-back" @tap="handleBack">
         <text class="header-back-icon">‹</text>
         <text class="header-back-text">返回</text>
@@ -241,6 +241,7 @@ const hallPreviewMap: Record<string, string> = {
 
 const filteredHalls = computed(() => props.halls)
 const shouldUseHostNavigation = computed(() => isEmbeddedInWechatMiniProgram())
+const showInternalHeader = computed(() => !shouldUseHostNavigation.value)
 const headerTitle = computed(() => {
   if (props.stage === 'unit') return props.selectedHallName || '选择业务单元'
   if (props.stage === 'stop') return props.selectedBusinessUnitName || '选择讲解点'
diff --git a/src/components/map/ThreeMap.vue b/src/components/map/ThreeMap.vue
index 75da63e..f2e287f 100644
--- a/src/components/map/ThreeMap.vue
+++ b/src/components/map/ThreeMap.vue
@@ -5142,9 +5142,30 @@ const handleFloorChange = async (floorId: string) => {
 }
 
 const showOverview = async () => {
-  // 建筑外观不再作为手动切换入口；只在初始加载与缩放自动切换时展示。
   if (activeView.value === 'overview') {
     resetCamera()
+    return
+  }
+
+  const previousLoadToken = modelLoadVersion
+  try {
+    isLoading.value = true
+    loadError.value = false
+    clearMapSelection(false)
+    clearRoutePreview()
+    await loadOverview()
+  } catch (error) {
+    if (!isStaleModelLoadError(error)) {
+      console.error('建筑外观模型加载失败:', error)
+      loadError.value = true
+      setFriendlyModelLoadError()
+    }
+    throw error
+  } finally {
+    const requestWasSuperseded = modelLoadVersion > previousLoadToken + 1
+    if (!requestWasSuperseded) {
+      isLoading.value = false
+    }
   }
 }
 
diff --git a/src/components/navigation/GuideMapShell.vue b/src/components/navigation/GuideMapShell.vue
index a038e5e..be1f818 100644
--- a/src/components/navigation/GuideMapShell.vue
+++ b/src/components/navigation/GuideMapShell.vue
@@ -705,6 +705,18 @@ const handleZoomClick = (direction: 'in' | 'out') => {
   emit('toolClick', direction === 'in' ? '放大' : '缩小')
 }
 
+const handleShowOverview = async () => {
+  indoorRendererRef.value?.disableAutoSwitchTemporarily?.(10000)
+  loadingFloorId.value = ''
+  requestedFloorId.value = ''
+  requestedFloorLabel.value = ''
+  failedFloorId.value = ''
+  await indoorRendererRef.value?.showOverview?.()
+  emit('selectionClear')
+  emit('indoorViewChange', 'overview')
+  emit('layerModeChange', 'single')
+}
+
 const handleMoreTap = () => {
   emit('moreClick')
 }
@@ -766,7 +778,8 @@ const handleOutdoorMarkerClick = (markerId: string) => {
 defineExpose({
   clearRoute: () => {
     indoorRendererRef.value?.clearRoute?.()
-  }
+  },
+  showOverview: handleShowOverview
 })
 </script>
 
diff --git a/src/pages/index/index.vue b/src/pages/index/index.vue
index 3fbdc27..b12a365 100644
--- a/src/pages/index/index.vue
+++ b/src/pages/index/index.vue
@@ -135,7 +135,7 @@
             <view class="guide-quick-icon-floor top"></view>
             <view class="guide-quick-icon-floor bottom"></view>
           </view>
-          <text class="guide-quick-action-text">馆内</text>
+          <text class="guide-quick-action-text">{{ indoorQuickActionLabel }}</text>
         </view>
         <view
           class="guide-quick-action"
@@ -416,10 +416,12 @@ const routeReady = ref(false)
 const activeRoutePreview = ref<GuideRouteResult | null>(null)
 const isSimulatingRoute = ref(false)
 const isPoiCardCollapsed = ref(false)
+const returningToOverview = ref(false)
 
 // GuideMapShell 组件引用，用于显式调用路线清除方法
 const guideMapShellRef = ref<{
   clearRoute?: () => void
+  showOverview?: () => Promise<void> | void
 } | null>(null)
 const homeSearchPanelRef = ref<{
   expandHomePanel?: () => void
@@ -696,6 +698,9 @@ const guideQuickActiveAction = computed<'indoor' | 'arrival' | 'explain'>(() =>
   if (showArrivalPanel.value) return 'arrival'
   return is3DMode.value ? 'indoor' : 'arrival'
 })
+const indoorQuickActionLabel = computed(() => (
+  is3DMode.value && indoorView.value !== 'overview' ? '外观' : '馆内'
+))
 
 const toRoutePointOption = (target: GuideRouteTarget): RoutePointOption => ({
   poiId: target.poiId,
@@ -1299,7 +1304,36 @@ const handleSwitchEntrance = () => {
   guideOutdoorState.value = 'home'
 }
 
-const handleMoreRouteGuide = () => {
+const handleMoreRouteGuide = async () => {
+  if (returningToOverview.value) return
+
+  if (is3DMode.value && indoorView.value !== 'overview') {
+    returningToOverview.value = true
+    showRoutePlanner.value = false
+    selectedGuidePoi.value = null
+    isPoiCardCollapsed.value = false
+    isSimulatingRoute.value = false
+    requestedFloorId.value = ''
+    requestedFloorLabel.value = ''
+    loadingFloorId.value = ''
+    failedFloorId.value = ''
+    clearRoutePreviewState()
+
+    try {
+      await guideMapShellRef.value?.showOverview?.()
+      indoorView.value = 'overview'
+      guideOutdoorState.value = 'home'
+      closeHomeSearchDock()
+      showIndoorHint('已返回建筑外观，可放大再次进入馆内', 3200)
+    } catch (error) {
+      console.error('返回建筑外观失败:', error)
+      showIndoorHint('建筑外观加载失败，请稍后重试', 3200)
+    } finally {
+      returningToOverview.value = false
+    }
+    return
+  }
+
   closeArrivalPanel()
   showRoutePlanner.value = false
   is3DMode.value = true