diff --git a/convert-w2p.js b/convert-w2p.js
index daa4bb8..57a998c 100644
--- a/convert-w2p.js
+++ b/convert-w2p.js
@@ -932,16 +932,18 @@ async function convert(input) {
   // 第三步：组装最终 Schema
   // ----------------------------------------------------------
   // 画布尺寸：多 slide（PPT设计稿）用容器尺寸，单 slide（网页）用 canvas
+  // 限制最大高度 140cm（WPS 上限约140cm）
+  const MAX_H_IN = 55.12; // 140cm
   let layout = 'LAYOUT_16x9';
   var sizeSource;
   if (slideGroups.length > 1) {
     sizeSource = slideGroups[0].slideRect;
   } else {
-    sizeSource = { w: canvas.width || 1920, h: canvas.height || 1080 };
+    sizeSource = { w: canvas.width || 1920, h: Math.min(canvas.height || 1080, MAX_H_IN * 72) };
   }
   if (sizeSource.w && sizeSource.h) {
     const sw = sizeSource.w / 72;
-    const sh = sizeSource.h / 72;
+    const sh = Math.min(sizeSource.h / 72, MAX_H_IN);
     layout = 'CUSTOM';
     return {
       presentation: { layout: 'CUSTOM', slideWidth: sw, slideHeight: sh },
@@ -1046,7 +1048,30 @@ if (require.main === module) {
     
     const pptxPath = inputPath.replace(/\.json$/, '.pptx');
     pres.writeFile({ fileName: pptxPath }).then(() => {
-      console.log('✅ PPTX: ' + pptxPath);
+      // 后处理：给 sldSz 加 type="custom"，确保 WPS 等应用识别自定义尺寸
+      try {
+        const JSZip = require('jszip');
+        const zipData = fs.readFileSync(pptxPath);
+        JSZip.loadAsync(zipData).then(function(zip) {
+          return zip.file('ppt/presentation.xml').async('string');
+        }).then(function(presXml) {
+          if (presXml.includes('sldSz') && !presXml.includes('type="custom"')) {
+            var fixed = presXml.replace(/sldSz cx="([^"]*)" cy="([^"]*)"/, 'sldSz cx="$1" cy="$2" type="custom"');
+            return JSZip.loadAsync(zipData).then(function(zip) {
+              zip.file('ppt/presentation.xml', fixed);
+              return zip.generateAsync({ type: 'nodebuffer', compression: 'DEFLATE' });
+            }).then(function(buf) {
+              fs.writeFileSync(pptxPath, buf);
+            });
+          }
+        }).then(function() {
+          console.log('✅ PPTX: ' + pptxPath);
+        }).catch(function(e) {
+          console.log('✅ PPTX: ' + pptxPath + ' (后处理跳过)');
+        });
+      } catch (e) {
+        console.log('✅ PPTX: ' + pptxPath + ' (后处理跳过)');
+      }
     }).catch(e => console.error('❌ PPTX 渲染失败:', e.message));
     
     fs.writeFileSync(outputPath, JSON.stringify(result, null, 2), 'utf8');