diff --git a/src/pages/explain/list.vue b/src/pages/explain/list.vue
index 2f1484d..16667f8 100644
--- a/src/pages/explain/list.vue
+++ b/src/pages/explain/list.vue
@@ -20,11 +20,10 @@
 </template>
 
 <script setup lang="ts">
-import { computed, ref } from 'vue'
-import { onLoad, onUnload } from '@dcloudio/uni-app'
+import { computed, onMounted, onUnmounted, ref } from 'vue'
+import { onLoad } from '@dcloudio/uni-app'
 import GuidePageFrame from '@/components/navigation/GuidePageFrame.vue'
 import ExplainHallSelect, {
-  type ExplainBusinessUnitSelectItem,
   type ExplainHallSelectItem
 } from '@/components/explain/ExplainHallSelect.vue'
 import {
@@ -69,53 +68,49 @@ const buildExplainHallItems = (
 
 const shouldUseHostNavigation = computed(() => isEmbeddedInWechatMiniProgram())
 
-const explainBusinessUnitItems = computed<ExplainBusinessUnitSelectItem[]>(() => (
-  []))
-
-
-type ExplainHistoryState = {
-  museumExplainList?: boolean
+type ExplainListHistoryState = {
+  museumGuidePage?: 'explain-list'
+  [key: string]: unknown
 }
 
-let syncingExplainHistory = false
-let applyingExplainHistory = false
+let explainListHistoryPushed = false
+let returningFromExplainListHistory = false
 
-const currentExplainHistoryState = (): ExplainHistoryState => ({
-  museumExplainList: true
-})
+const isExplainListHistoryState = (state: unknown): state is ExplainListHistoryState => (
+  Boolean(
+    state
+    && typeof state === 'object'
+    && (state as ExplainListHistoryState).museumGuidePage === 'explain-list'
+  )
+)
 
-const writeExplainHistoryState = (replace = false) => {
+const pushExplainListHistory = () => {
   if (!shouldUseHostNavigation.value || typeof window === 'undefined') return
+  if (explainListHistoryPushed) return
 
-  syncingExplainHistory = true
-  const state = currentExplainHistoryState()
-  const url = window.location.href
-
-  if (replace) {
-    window.history.replaceState(state, '', url)
-  } else {
-    window.history.pushState(state, '', url)
+  if (isExplainListHistoryState(window.history.state)) {
+    explainListHistoryPushed = true
+    return
   }
 
-  window.setTimeout(() => {
-    syncingExplainHistory = false
-  }, 0)
+  window.history.pushState({
+    ...(window.history.state || {}),
+    museumGuidePage: 'explain-list'
+  } satisfies ExplainListHistoryState, '', window.location.href)
+  explainListHistoryPushed = true
 }
 
-const applyExplainHistoryState = async (state: ExplainHistoryState | null) => {
-  if (!state?.museumExplainList || applyingExplainHistory) return
+const handleExplainListHistoryPopState = (event: PopStateEvent) => {
+  if (!shouldUseHostNavigation.value || returningFromExplainListHistory) return
 
-  applyingExplainHistory = true
-  applyingExplainHistory = false
-}
+  if (isExplainListHistoryState(event.state)) {
+    explainListHistoryPushed = true
+    return
+  }
 
-const handleExplainHistoryPopState = (event: PopStateEvent) => {
-  if (syncingExplainHistory) return
-  void applyExplainHistoryState((event.state || null) as ExplainHistoryState | null)
-}
-
-const replaceExplainStageHistory = () => {
-  writeExplainHistoryState(true)
+  explainListHistoryPushed = false
+  returningFromExplainListHistory = true
+  navigateToGuideTopTab('explain')
 }
 
 const loadExplainHalls = async () => {
@@ -144,21 +139,26 @@ const loadExplainHalls = async () => {
 }
 
 onLoad(() => {
-  replaceExplainStageHistory()
+  pushExplainListHistory()
   void loadExplainHalls()
-
-  if (typeof window !== 'undefined') {
-    window.addEventListener('popstate', handleExplainHistoryPopState)
-  }
 })
 
-onUnload(() => {
-  if (typeof window !== 'undefined') {
-    window.removeEventListener('popstate', handleExplainHistoryPopState)
-  }
+onMounted(() => {
+  if (typeof window === 'undefined') return
+  window.addEventListener('popstate', handleExplainListHistoryPopState)
+})
+
+onUnmounted(() => {
+  if (typeof window === 'undefined') return
+  window.removeEventListener('popstate', handleExplainListHistoryPopState)
 })
 
 const handleBack = () => {
+  if (shouldUseHostNavigation.value) {
+    navigateToGuideTopTab('explain')
+    return
+  }
+
   uni.navigateBack({
     delta: 1,
     fail: () => {
diff --git a/src/pages/index/index.vue b/src/pages/index/index.vue
index fc6b4d9..71d0176 100644
--- a/src/pages/index/index.vue
+++ b/src/pages/index/index.vue
@@ -307,6 +307,7 @@ import {
   isGuideTopTab,
   type GuideTopTab
 } from '@/utils/guideTopTabs'
+import { isEmbeddedInWechatMiniProgram } from '@/utils/hostEnvironment'
 import {
   guideUseCase
 } from '@/usecases/guideUseCase'
@@ -418,7 +419,7 @@ const guideMapShellRef = ref<{
 } | null>(null)
 const homeSearchPanelRef = ref<{
   collapseHomePanel?: () => void
-  resetSearchState?: () => void
+  resetSearchState?: () => Promise<void> | void
   returnToCollapsedAfterDetail?: () => Promise<void>
   restoreResultListScroll?: () => Promise<void>
 } | null>(null)
@@ -430,6 +431,14 @@ let searchTargetFocusRequestId = 0
 let pendingCollapseSearchAfterDetail = false
 let pendingSearchDetailFocusRequest: TargetPoiFocusRequestViewModel | null = null
 
+type PoiSearchOverlayHistoryState = {
+  museumGuideOverlay?: 'poi-search'
+  [key: string]: unknown
+}
+
+let poiSearchHistoryPushed = false
+let removingPoiSearchHistory = false
+
 let launchOverlayFallbackTimer: ReturnType<typeof setTimeout> | null = null
 let launchOverlayFadeTimer: ReturnType<typeof setTimeout> | null = null
 let launchOverlayHideDelayTimer: ReturnType<typeof setTimeout> | null = null
@@ -725,6 +734,87 @@ const syncTopTabToUrl = (tabId: GuideTopTab) => {
   }
 }
 
+const isPoiSearchOverlayHistoryState = (state: unknown): state is PoiSearchOverlayHistoryState => (
+  Boolean(
+    state
+    && typeof state === 'object'
+    && (state as PoiSearchOverlayHistoryState).museumGuideOverlay === 'poi-search'
+  )
+)
+
+const canManagePoiSearchOverlayHistory = () => (
+  typeof window !== 'undefined'
+  && isIndexHashRoute()
+  && isEmbeddedInWechatMiniProgram()
+)
+
+const removePoiSearchOverlayFromCurrentHistoryState = () => {
+  if (!canManagePoiSearchOverlayHistory()) return
+  if (!isPoiSearchOverlayHistoryState(window.history.state)) return
+
+  const nextState = { ...window.history.state }
+  delete nextState.museumGuideOverlay
+  window.history.replaceState(nextState, '', window.location.href)
+}
+
+const pushPoiSearchOverlayHistory = () => {
+  if (!canManagePoiSearchOverlayHistory() || !homeSearchExpanded.value) return
+  if (poiSearchHistoryPushed) return
+
+  if (isPoiSearchOverlayHistoryState(window.history.state)) {
+    poiSearchHistoryPushed = true
+    return
+  }
+
+  window.history.pushState({
+    ...(window.history.state || {}),
+    museumGuideOverlay: 'poi-search'
+  } satisfies PoiSearchOverlayHistoryState, '', window.location.href)
+  poiSearchHistoryPushed = true
+}
+
+const removePoiSearchOverlayHistory = () => {
+  if (!canManagePoiSearchOverlayHistory() || !poiSearchHistoryPushed) return
+
+  if (!isPoiSearchOverlayHistoryState(window.history.state)) {
+    poiSearchHistoryPushed = false
+    return
+  }
+
+  poiSearchHistoryPushed = false
+  removingPoiSearchHistory = true
+  window.history.back()
+}
+
+const collapsePoiSearchAfterHistoryBack = async () => {
+  homeSearchPanelRef.value?.collapseHomePanel?.()
+  await homeSearchPanelRef.value?.resetSearchState?.()
+  clearHomeSearchMapState()
+  selectedGuidePoi.value = null
+  isPoiCardCollapsed.value = false
+  homeSearchExpanded.value = false
+}
+
+const handlePoiSearchHistoryPopState = (event: PopStateEvent) => {
+  if (!canManagePoiSearchOverlayHistory()) return
+
+  if (removingPoiSearchHistory) {
+    removingPoiSearchHistory = false
+    poiSearchHistoryPushed = false
+    if (homeSearchExpanded.value) pushPoiSearchOverlayHistory()
+    return
+  }
+
+  if (!homeSearchExpanded.value) return
+  if (isPoiSearchOverlayHistoryState(event.state)) {
+    poiSearchHistoryPushed = true
+    return
+  }
+
+  poiSearchHistoryPushed = false
+  void collapsePoiSearchAfterHistoryBack()
+}
+
 const loadTopTabData = (tabId: GuideTopTab) => {
   if (tabId === 'explain') {
     void loadExplainHalls()
@@ -786,7 +876,9 @@ onMounted(() => {
   if (typeof window === 'undefined') return
 
   syncTopTabFromHash()
+  removePoiSearchOverlayFromCurrentHistoryState()
   window.addEventListener('hashchange', syncTopTabFromHash)
+  window.addEventListener('popstate', handlePoiSearchHistoryPopState)
 })
 
 onUnmounted(() => {
@@ -800,6 +892,7 @@ onUnmounted(() => {
   if (typeof window === 'undefined') return
 
   window.removeEventListener('hashchange', syncTopTabFromHash)
+  window.removeEventListener('popstate', handlePoiSearchHistoryPopState)
 })
 
 onLoad((options: any = {}) => {
@@ -1412,6 +1505,12 @@ const handleExplainQuickTap = () => {
 
 const handleHomeSearchExpandedChange = (expanded: boolean) => {
   homeSearchExpanded.value = expanded
+  if (expanded) {
+    pushPoiSearchOverlayHistory()
+    return
+  }
+
+  removePoiSearchOverlayHistory()
 }
 
 const clearHomeSearchMapState = () => {
diff --git a/src/utils/guideTopTabs.ts b/src/utils/guideTopTabs.ts
index e944dbd..8c9dcd3 100644
--- a/src/utils/guideTopTabs.ts
+++ b/src/utils/guideTopTabs.ts
@@ -1,5 +1,12 @@
 export type GuideTopTab = 'guide' | 'explain'
 export const GUIDE_LOCATION_PREVIEW_STORAGE_KEY = 'museum-guide:last-location-preview-url'
+const HOST_NAVIGATION_QUERY_KEYS = [
+  'embedded',
+  'embed',
+  'host',
+  'weapp',
+  'mini-program'
+]
 
 export const GUIDE_TOP_TABS: Array<{ id: GuideTopTab; label: string }> = [
   { id: 'guide', label: '馆内' },
@@ -10,7 +17,32 @@ export const isGuideTopTab = (value: unknown): value is GuideTopTab => {
   return value === 'guide' || value === 'explain'
 }
 
-export const guideTopTabUrl = (tab: GuideTopTab) => `/pages/index/index?tab=${tab}`
+const getHostNavigationQueryParams = () => {
+  if (typeof window === 'undefined') return new URLSearchParams()
+
+  const searchParams = new URLSearchParams(window.location.search)
+  const hash = window.location.hash || ''
+  const hashQueryStart = hash.indexOf('?')
+  if (hashQueryStart >= 0) {
+    const hashParams = new URLSearchParams(hash.slice(hashQueryStart + 1))
+    hashParams.forEach((value, key) => {
+      if (!searchParams.has(key)) searchParams.set(key, value)
+    })
+  }
+
+  const hostParams = new URLSearchParams()
+  HOST_NAVIGATION_QUERY_KEYS.forEach((key) => {
+    const value = searchParams.get(key)
+    if (value !== null) hostParams.set(key, value)
+  })
+  return hostParams
+}
+
+export const guideTopTabUrl = (tab: GuideTopTab) => {
+  const params = new URLSearchParams({ tab })
+  getHostNavigationQueryParams().forEach((value, key) => params.set(key, value))
+  return `/pages/index/index?${params.toString()}`
+}
 
 export const saveLastGuideLocationPreviewUrl = (url: string) => {
   if (typeof window === 'undefined' || !url) return
diff --git a/tests/unit/ExplainListNavigation.spec.ts b/tests/unit/ExplainListNavigation.spec.ts
new file mode 100644
index 0000000..8210714
--- /dev/null
+++ b/tests/unit/ExplainListNavigation.spec.ts
@@ -0,0 +1,129 @@
+// @vitest-environment happy-dom
+
+import { defineComponent } from 'vue'
+import { flushPromises, mount } from '@vue/test-utils'
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest'
+import ExplainListPage from '@/pages/explain/list.vue'
+
+const hostEnvironmentMocks = vi.hoisted(() => ({
+  embeddedInWechatMiniProgram: false
+}))
+
+const testState = vi.hoisted(() => ({
+  onLoadHandler: null as null | (() => void)
+}))
+
+vi.mock('@dcloudio/uni-app', () => ({
+  onLoad: (handler: () => void) => {
+    testState.onLoadHandler = handler
+  }
+}))
+
+vi.mock('@/utils/hostEnvironment', () => ({
+  isEmbeddedInWechatMiniProgram: () => hostEnvironmentMocks.embeddedInWechatMiniProgram
+}))
+
+vi.mock('@/usecases/explainUseCase', () => ({
+  explainUseCase: {
+    loadExplainHalls: async () => [],
+    loadExplainHallSummaries: async () => ({})
+  }
+}))
+
+const GuidePageFrameStub = defineComponent({
+  name: 'GuidePageFrame',
+  template: '<main><slot /></main>'
+})
+
+const ExplainHallSelectStub = defineComponent({
+  name: 'ExplainHallSelect',
+  emits: ['back'],
+  template: '<button data-testid="explain-list-back" @click="$emit(\'back\')">返回</button>'
+})
+
+const mountExplainList = () => mount(ExplainListPage, {
+  global: {
+    stubs: {
+      GuidePageFrame: GuidePageFrameStub,
+      ExplainHallSelect: ExplainHallSelectStub
+    }
+  }
+})
+
+beforeEach(() => {
+  hostEnvironmentMocks.embeddedInWechatMiniProgram = false
+  testState.onLoadHandler = null
+  window.location.hash = '#/pages/explain/list'
+  window.history.replaceState({}, '', window.location.href)
+  vi.stubGlobal('uni', {
+    navigateBack: vi.fn(),
+    redirectTo: vi.fn(),
+    reLaunch: vi.fn()
+  })
+})
+
+afterEach(() => {
+  vi.restoreAllMocks()
+  vi.unstubAllGlobals()
+})
+
+describe('讲解展厅列表返回', () => {
+  it('微信内嵌时不调用 navigateBack，并保留宿主标识返回首页讲解 Tab', async () => {
+    hostEnvironmentMocks.embeddedInWechatMiniProgram = true
+    window.location.hash = '#/pages/explain/list?embedded=wechat-mini-program&weapp=1&mini-program=1'
+    window.history.replaceState({}, '', window.location.href)
+    const wrapper = mountExplainList()
+    const pushState = vi.spyOn(window.history, 'pushState')
+    testState.onLoadHandler?.()
+    await flushPromises()
+
+    await wrapper.get('[data-testid="explain-list-back"]').trigger('click')
+
+    expect(pushState).toHaveBeenCalledWith(
+      expect.objectContaining({ museumGuidePage: 'explain-list' }),
+      '',
+      window.location.href
+    )
+    expect(uni.navigateBack).not.toHaveBeenCalled()
+    expect(uni.reLaunch).toHaveBeenCalledTimes(1)
+    const url = vi.mocked(uni.reLaunch).mock.calls[0]?.[0]?.url || ''
+    const query = new URLSearchParams(url.split('?')[1])
+    expect(url.split('?')[0]).toBe('/pages/index/index')
+    expect(query.get('tab')).toBe('explain')
+    expect(query.get('embedded')).toBe('wechat-mini-program')
+    expect(query.get('weapp')).toBe('1')
+    expect(query.get('mini-program')).toBe('1')
+    wrapper.unmount()
+  })
+
+  it('微信内嵌浏览器返回时回到首页讲解 Tab', async () => {
+    hostEnvironmentMocks.embeddedInWechatMiniProgram = true
+    window.location.hash = '#/pages/explain/list?embedded=wechat-mini-program&weapp=1'
+    window.history.replaceState({}, '', window.location.href)
+    const wrapper = mountExplainList()
+    testState.onLoadHandler?.()
+    await flushPromises()
+
+    window.dispatchEvent(new PopStateEvent('popstate', { state: {} }))
+    await flushPromises()
+
+    expect(uni.navigateBack).not.toHaveBeenCalled()
+    const url = vi.mocked(uni.reLaunch).mock.calls[0]?.[0]?.url || ''
+    const query = new URLSearchParams(url.split('?')[1])
+    expect(url.split('?')[0]).toBe('/pages/index/index')
+    expect(query.get('tab')).toBe('explain')
+    expect(query.get('embedded')).toBe('wechat-mini-program')
+    expect(query.get('weapp')).toBe('1')
+    wrapper.unmount()
+  })
+
+  it('普通 H5 保持原有 navigateBack 行为', async () => {
+    const wrapper = mountExplainList()
+
+    await wrapper.get('[data-testid="explain-list-back"]').trigger('click')
+
+    expect(uni.navigateBack).toHaveBeenCalledWith(expect.objectContaining({ delta: 1 }))
+    expect(uni.reLaunch).not.toHaveBeenCalled()
+    wrapper.unmount()
+  })
+})
diff --git a/tests/unit/IndexPoiSearchFlow.spec.ts b/tests/unit/IndexPoiSearchFlow.spec.ts
index c96e0e4..9a42720 100644
--- a/tests/unit/IndexPoiSearchFlow.spec.ts
+++ b/tests/unit/IndexPoiSearchFlow.spec.ts
@@ -10,9 +10,14 @@ const testState = vi.hoisted(() => ({
   searchUnmountCount: 0,
   searchRestoreCount: 0,
   searchCollapseAfterDetailCount: 0,
+  searchResetCount: 0,
   onShowHandler: null as null | (() => Promise<void> | void)
 }))
 
+const hostEnvironmentMocks = vi.hoisted(() => ({
+  embeddedInWechatMiniProgram: false
+}))
+
 vi.mock('@dcloudio/uni-app', () => ({
   onLoad: vi.fn(),
   onShow: (handler: () => Promise<void> | void) => {
@@ -20,6 +25,10 @@ vi.mock('@dcloudio/uni-app', () => ({
   }
 }))
 
+vi.mock('@/utils/hostEnvironment', () => ({
+  isEmbeddedInWechatMiniProgram: () => hostEnvironmentMocks.embeddedInWechatMiniProgram
+}))
+
 const floors = [
   { id: 'L1', label: '1F', order: 1 },
   { id: 'L2', label: '2F', order: 2 }
@@ -100,7 +109,9 @@ const PoiSearchPanelStub = defineComponent({
   },
   methods: {
     collapseHomePanel() {},
-    resetSearchState() {},
+    resetSearchState() {
+      testState.searchResetCount += 1
+    },
     returnToCollapsedAfterDetail() {
       testState.searchCollapseAfterDetailCount += 1
     },
@@ -152,10 +163,12 @@ const mountIndex = async () => {
 }
 
 beforeEach(() => {
+  hostEnvironmentMocks.embeddedInWechatMiniProgram = false
   testState.searchMountCount = 0
   testState.searchUnmountCount = 0
   testState.searchRestoreCount = 0
   testState.searchCollapseAfterDetailCount = 0
+  testState.searchResetCount = 0
   testState.onShowHandler = null
   window.history.replaceState({}, '', '/#/pages/index/index?tab=guide')
   vi.stubGlobal('uni', {
@@ -168,10 +181,96 @@ beforeEach(() => {
 })
 
 afterEach(() => {
+  vi.restoreAllMocks()
   vi.unstubAllGlobals()
 })
 
 describe('首页搜索与地图闭环', () => {
+  it('微信内嵌展开搜索只写入一条覆盖层历史记录', async () => {
+    hostEnvironmentMocks.embeddedInWechatMiniProgram = true
+    window.location.hash = '#/pages/index/index?tab=guide&embedded=wechat-mini-program'
+    window.history.replaceState({}, '', window.location.href)
+    const wrapper = await mountIndex()
+    const search = wrapper.getComponent(PoiSearchPanelStub)
+    const pushState = vi.spyOn(window.history, 'pushState')
+
+    search.vm.$emit('expanded-change', true)
+    await flushPromises()
+    expect(pushState).toHaveBeenCalledTimes(1)
+    expect(pushState).toHaveBeenLastCalledWith(
+      expect.objectContaining({ museumGuideOverlay: 'poi-search' }),
+      '',
+      window.location.href
+    )
+
+    search.vm.$emit('expanded-change', true)
+    await flushPromises()
+    expect(pushState).toHaveBeenCalledTimes(1)
+    wrapper.unmount()
+  })
+
+  it('微信内嵌搜索返回消费 popstate 并回到首页收缩态', async () => {
+    hostEnvironmentMocks.embeddedInWechatMiniProgram = true
+    window.location.hash = '#/pages/index/index?tab=guide&embedded=wechat-mini-program'
+    window.history.replaceState({}, '', window.location.href)
+    const wrapper = await mountIndex()
+    const search = wrapper.getComponent(PoiSearchPanelStub)
+    const currentUrl = window.location.href
+
+    search.vm.$emit('expanded-change', true)
+    await flushPromises()
+    window.dispatchEvent(new PopStateEvent('popstate', { state: {} }))
+    await flushPromises()
+
+    expect(testState.searchResetCount).toBeGreaterThan(0)
+    expect(window.location.href).toBe(currentUrl)
+    expect(wrapper.getComponent(GuideMapShellStub).props('visiblePoiIds')).toBeNull()
+    wrapper.unmount()
+  })
+
+  it('微信内嵌搜索多次展开和收缩不会累积覆盖层历史', async () => {
+    hostEnvironmentMocks.embeddedInWechatMiniProgram = true
+    window.location.hash = '#/pages/index/index?tab=guide&embedded=wechat-mini-program'
+    window.history.replaceState({}, '', window.location.href)
+    const wrapper = await mountIndex()
+    const search = wrapper.getComponent(PoiSearchPanelStub)
+    let currentHistoryState: Record<string, unknown> = {}
+    vi.spyOn(window.history, 'state', 'get').mockImplementation(() => currentHistoryState)
+    const pushState = vi.spyOn(window.history, 'pushState').mockImplementation((state) => {
+      currentHistoryState = state as Record<string, unknown>
+    })
+    const historyBack = vi.spyOn(window.history, 'back').mockImplementation(() => {
+      currentHistoryState = {}
+      window.dispatchEvent(new PopStateEvent('popstate', { state: {} }))
+    })
+
+    search.vm.$emit('expanded-change', true)
+    search.vm.$emit('expanded-change', false)
+    await flushPromises()
+    search.vm.$emit('expanded-change', true)
+    search.vm.$emit('expanded-change', false)
+    await flushPromises()
+
+    expect(pushState).toHaveBeenCalledTimes(2)
+    expect(historyBack).toHaveBeenCalledTimes(2)
+    expect(currentHistoryState).not.toMatchObject({ museumGuideOverlay: 'poi-search' })
+    wrapper.unmount()
+  })
+
+  it('普通 H5 展开搜索不写入覆盖层历史，也不消费浏览器返回', async () => {
+    const wrapper = await mountIndex()
+    const search = wrapper.getComponent(PoiSearchPanelStub)
+    const pushState = vi.spyOn(window.history, 'pushState')
+
+    search.vm.$emit('expanded-change', true)
+    window.dispatchEvent(new PopStateEvent('popstate', { state: {} }))
+    await flushPromises()
+
+    expect(pushState).not.toHaveBeenCalled()
+    expect(testState.searchResetCount).toBe(0)
+    wrapper.unmount()
+  })
+
   it('同步首页标签时保留内嵌宿主参数', async () => {
     window.location.hash = '#/pages/index/index?tab=guide&embedded=wechat-mini-program'