diff --git a/src/components/map/ThreeMap.vue b/src/components/map/ThreeMap.vue
index 9d26664..5e94176 100644
--- a/src/components/map/ThreeMap.vue
+++ b/src/components/map/ThreeMap.vue
@@ -63,7 +63,8 @@ import type {
   GuideRouteResult
 } from '@/domain/museum'
 import {
-  compareFloorsTopToBottom
+  compareFloorsTopToBottom,
+  getFloorSortLevel
 } from '@/domain/guideFloor'
 import {
   guideModelLoadManager,
@@ -3139,7 +3140,8 @@ const resolveFloorIdFromRequest = (requestedFloorId?: string | null) => {
 }
 
 const isGroundEntryFloor = (floor: FloorIndexItem) => (
-  getFloorMatchKeys(floor).some((key) => {
+  getFloorSortLevel(floor) === 1
+  || getFloorMatchKeys(floor).some((key) => {
     const normalizedKey = normalizeModelMatchKey(key)
     return normalizedKey === 'l1' || normalizedKey === '1f'
   })
diff --git a/src/pages/index/index.vue b/src/pages/index/index.vue
index 1069e71..0a685ee 100644
--- a/src/pages/index/index.vue
+++ b/src/pages/index/index.vue
@@ -345,6 +345,7 @@ import type {
   MuseumHall,
   MuseumPoi
 } from '@/domain/museum'
+import { getFloorSortLevel } from '@/domain/guideFloor'
 
 type GuideIndoorView = 'overview' | 'floor' | 'multi'
 type LayerDisplayMode = 'single' | 'multi'
@@ -583,7 +584,8 @@ const guideFloors = ref<MuseumFloor[]>([])
 const normalizeGuideFloorId = (labelOrId: string) => guideUseCase.normalizeFloorId(labelOrId)
 const getPreferredInitialGuideFloorId = (floors: MuseumFloor[]) => (
   floors.find((floor) => (
-    normalizeGuideFloorId(floor.id) === 'L1'
+    getFloorSortLevel(floor) === 1
+    || normalizeGuideFloorId(floor.id) === 'L1'
     || normalizeGuideFloorId(floor.label) === 'L1'
   ))?.id
   || floors[0]?.id
diff --git a/tests/unit/IndexPoiSearchFlow.spec.ts b/tests/unit/IndexPoiSearchFlow.spec.ts
index f5700c7..9d00fa7 100644
--- a/tests/unit/IndexPoiSearchFlow.spec.ts
+++ b/tests/unit/IndexPoiSearchFlow.spec.ts
@@ -366,17 +366,17 @@ describe('首页搜索与地图闭环', () => {
   it('楼层数据按高到低返回时，首次进入仍将 1F 作为自动缩放的默认目标', async () => {
     const originalFloors = [...floors]
     floors.splice(0, floors.length,
-      { id: 'L5', label: '5F', order: 5 },
-      { id: 'L2', label: '2F', order: 2 },
-      { id: 'L1', label: '1F', order: 1 }
+      { id: 'F5', label: 'F5', order: 5 },
+      { id: 'F2', label: 'F2', order: 2 },
+      { id: 'F1', label: 'F1', order: 1 }
     )
 
     try {
       const wrapper = await mountIndex()
       const map = wrapper.getComponent(GuideMapShellStub)
 
-      expect(map.props('activeFloor')).toBe('L1')
-      expect(wrapper.getComponent(PoiSearchPanelStub).props('currentFloorId')).toBe('L1')
+      expect(map.props('activeFloor')).toBe('F1')
+      expect(wrapper.getComponent(PoiSearchPanelStub).props('currentFloorId')).toBe('F1')
     } finally {
       floors.splice(0, floors.length, ...originalFloors)
     }