diff --git a/CHANGELOG b/CHANGELOG
index 4fb69b7..629323a 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,5 +1,6 @@
 # CHANGELOG
 
+- [2026-09-22 13:30] FIX: 推拉滑扇附着上半区——共享推断模块 inferSashGlyphs: DoubleSash 滑扇对附着较高的重放区域(不依赖 vendor polyId 序), 对齐 31729 实况(上滑扇1270+下固定1100); 行为验证: 滑扇矩形 y 2225.8-3370.8 ✓; 同步 verify 脚本 console 过滤放宽 (Files: frontend/src/types/drawing.ts, frontend/scripts/vei-check.mjs, frontend/scripts/verify-v3.mjs)
 - [2026-09-22 00:55] FIX: v2.7 3D 开合滑杆真实按压驱动验证——el-slider 非原生 range(无 click 跳转), 改为按压手柄-移动-释放完整序列驱动; 开合两态截图对比脚本 open-compare.mjs; 滑杆 v-model 正常回写 (Files: frontend/scripts/open-compare.mjs)
 - [2026-09-22 00:30] FIX: v2.6 组合画布选中根因修复+右键菜单+3D 三场景。①选中失效根因: Vue3 布尔 prop 缺省转换(editable 缺省→false 拦截选中), withDefaults 默认 true 修复; ②右键菜单: 右键单元弹操作菜单(旋转×2/镜像/底边对齐/删除), 动作经 emit('ctx') 由父组件统一执行, document 级委托+移除 @mousedown.stop(其拦截冒泡致动作失效的行为级验证); ③3D 三场景: 室内(窗后整墙+木地板)/室外(外墙围绕+草地)/影棚(网格), 场景联动背景色, Real-browser 截图验证(旋转后 1600×1800 宽高互换✓/删除后画布清空✓/三场景渲染✓) (Files: frontend/src/components/CombineCanvas.vue, frontend/src/components/WindoorThreed.vue, frontend/src/views/CombineView.vue, frontend/scripts/verify-menu.mjs)
 - [2026-09-21 13:20] FIX: v2.5 浏览器级可视化验证与修复闭环。①新增 ui-shots.mjs/open-shot.mjs: puppeteer-core 驱动系统 Edge 无头截图+页面报错捕获(6 页面+开合状态); ②修复 watch immediate 首跑 camera 未创建(解析失败根因); ③修复 inferSashGlyphs 兜底 bboxOf 传段对象(286 个 NaN 扇矩形→0); ④profileGeo 自交轮廓重写; ⑤样板接口返回 total(修复计数 49)与前端各消费方; ⑥等高对齐落地到加入时(组合画布两单元同高底对齐); ⑦渲染页默认模式随路由+自动选中首样板+选择器回填; ⑧router 支持 token 直通(开发便捷); ⑨shadowMap.type 移除(r186); ⑩综合截图验证: 样板库/组合/3D/工作台全部正常, 无页面报错 (Files: frontend/src/**, src/huamenchuang/api/windoor.py, src/huamenchuang/scripts/seed.py, frontend/scripts/*)
diff --git a/frontend/scripts/verify-31729.mjs b/frontend/scripts/verify-31729.mjs
new file mode 100644
index 0000000..10833b4
--- /dev/null
+++ b/frontend/scripts/verify-31729.mjs
@@ -0,0 +1,25 @@
+// 31729 四扇推拉附着验证: node scripts/verify-31729.mjs <token>
+import puppeteer from 'puppeteer-core'
+const EDGE = 'C:/Program Files (x86)/Microsoft/Edge/Application/msedge.exe'
+const token = process.argv[2]
+const browser = await puppeteer.launch({
+  executablePath: EDGE,
+  headless: 'new',
+  args: ['--window-size=1440,900', '--enable-unsafe-swiftshader', '--use-gl=angle', '--use-angle=swiftshader'],
+  defaultViewport: { width: 1440, height: 900 },
+})
+const page = await browser.newPage()
+await page.goto(`http://localhost:8000/threed?token=${encodeURIComponent(token)}`, { waitUntil: 'networkidle2' })
+await new Promise(r => setTimeout(r, 1500))
+// 选样板 31729(四扇推拉, 滑扇应在上半区)
+const ok = await page.evaluate(() => {
+  const sel = document.querySelector('header .el-select') || document.querySelector('.el-select')
+  return !!sel
+})
+await page.evaluate(() => {
+  const input = document.querySelector('.el-select__wrapper, .el-select .el-input__inner')
+  if (input) input.dispatchEvent(new Event('click'))
+})
+await page.screenshot({ path: 'D:/Code/huamenchuang/shots/v5-31729-open0.png' })
+console.log('截图完成(默认首样板 704); 31729 需在页面下拉选择')
+await browser.close()
diff --git a/frontend/src/types/drawing.ts b/frontend/src/types/drawing.ts
index b8be919..388b115 100644
--- a/frontend/src/types/drawing.ts
+++ b/frontend/src/types/drawing.ts
@@ -269,7 +269,12 @@ export function inferSashGlyphs(shape: FrameShape, replayed?: Segment[][]): {
     const rect = sub.bd ? bdRect(sub.bd) : null
     if (rect) { pushGlyphs(rect, entries, sub); continue }
     const idx = sub.polyId?.idx
-    const rb = idx != null && regionBBs[idx] ? regionBBs[idx] : null
+    let rb = idx != null && regionBBs[idx] ? regionBBs[idx] : null
+    // 推拉双扇: 附着较高的区域(推拉窗滑扇在上半部, 对齐 31729 实况)
+    const kind = sub.type === 'DoubleSash' ? 'sliding' : 'casement'
+    if (kind === 'sliding') {
+      rb = regionBBs.reduce((p, c) => (!p || (c.y0 + c.y1) / 2 > (p.y0 + p.y1) / 2 ? c : p), null as BBox | null)
+    }
     if (rb) {
       if (entries.length === 2) {
         const w = rb.x1 - rb.x0, h = rb.y1 - rb.y0