diff --git a/src/data/adapters/navAssetsAdapter.ts b/src/data/adapters/navAssetsAdapter.ts
index 5412a7e..a47b616 100644
--- a/src/data/adapters/navAssetsAdapter.ts
+++ b/src/data/adapters/navAssetsAdapter.ts
@@ -19,11 +19,13 @@ export const formatNavFloorLabel = (floorId: string) => {
   const value = Number(match[1])
   if (Number.isNaN(value)) return floorId
 
+  if (value === 1.5) return 'MF'
   return value < 0 ? `B${Math.abs(value)}` : `${value}F`
 }
 
 export const navFloorIdFromLabel = (labelOrId: string) => {
   if (floorIdPattern.test(labelOrId)) return labelOrId
+  if (labelOrId.trim().toUpperCase() === 'MF') return 'L1.5'
 
   const basementMatch = labelOrId.match(/^B(\d+(?:\.\d+)?)$/i)
   if (basementMatch) return `L-${basementMatch[1]}`
diff --git a/src/data/adapters/sgsSdkGuideAdapter.ts b/src/data/adapters/sgsSdkGuideAdapter.ts
index 814ada3..b3d6a7f 100644
--- a/src/data/adapters/sgsSdkGuideAdapter.ts
+++ b/src/data/adapters/sgsSdkGuideAdapter.ts
@@ -225,8 +225,8 @@ export const formatSgsFloorLabel = (floorCode?: string | null, floorName?: strin
   const basementMatch = floorCode?.match(/^L-(\d+(?:\.\d+)?)$/)
   if (basementMatch) return `B${basementMatch[1]}`
 
-  const floorMatch = floorCode?.match(/^L(\d+(?:\.\d+)?)$/)
-  if (floorMatch) return `${floorMatch[1]}F`
+  const floorMatch = floorCode?.match(/^L(\d+(?:\.\d+)?)$/)
+  if (floorMatch) return floorMatch[1] === '1.5' ? 'MF' : `${floorMatch[1]}F`
 
   return floorName || floorCode || '未知楼层'
 }
diff --git a/src/domain/guideFloor.ts b/src/domain/guideFloor.ts
index b9bcf08..7ed293d 100644
--- a/src/domain/guideFloor.ts
+++ b/src/domain/guideFloor.ts
@@ -16,7 +16,7 @@ interface FloorLike {
 }
 
 const indoorFloorCodePattern = /^L-?\d+(?:\.\d+)?$/i
-const indoorFloorLabelPattern = /^(?:B\d+(?:\.\d+)?|\d+(?:\.\d+)?F)$/i
+const indoorFloorLabelPattern = /^(?:B\d+(?:\.\d+)?|\d+(?:\.\d+)?F|MF)$/i
 const rawNumericIdPattern = /^\d{6,}$/
 const nonNavigableFloorPattern = /(EXTERIOR|OUTDOOR|BUILDING|FACADE|EXTERNAL|外立面|建筑外观|建筑外立面|馆外模型|馆外场景|馆外底图|馆外建筑|馆外外观|馆外)$/i
 
@@ -37,6 +37,8 @@ const parseFloorLevelFromToken = (value: unknown) => {
   const labelMatch = normalized.match(/^(\d+(?:\.\d+)?)F$/)
   if (labelMatch) return Number(labelMatch[1])
 
+  if (normalized === 'MF') return 1.5
+
   const codeMatch = normalized.match(/^L(-?\d+(?:\.\d+)?)$/)
   if (codeMatch) return Number(codeMatch[1])
 
diff --git a/tests/unit/floorPresentation.spec.ts b/tests/unit/floorPresentation.spec.ts
new file mode 100644
index 0000000..d9fc20a
--- /dev/null
+++ b/tests/unit/floorPresentation.spec.ts
@@ -0,0 +1,17 @@
+import { describe, expect, it } from 'vitest'
+import { formatNavFloorLabel, navFloorIdFromLabel } from '@/data/adapters/navAssetsAdapter'
+import { formatSgsFloorLabel } from '@/data/adapters/sgsSdkGuideAdapter'
+import { getFloorSortLevel, isIndoorNavigableFloor } from '@/domain/guideFloor'
+
+describe('中间层游客展示', () => {
+  it('将稳定层 ID L1.5 显示为 MF，并可反向解析', () => {
+    expect(formatNavFloorLabel('L1.5')).toBe('MF')
+    expect(navFloorIdFromLabel('MF')).toBe('L1.5')
+    expect(formatSgsFloorLabel('L1.5')).toBe('MF')
+  })
+
+  it('MF 保持可导航和正确的楼层排序', () => {
+    expect(isIndoorNavigableFloor({ label: 'MF' })).toBe(true)
+    expect(getFloorSortLevel({ label: 'MF' })).toBe(1.5)
+  })
+})