diff --git a/web-to-ppt/popup.js b/web-to-ppt/popup.js
index fbf29d3..5c47bd1 100644
--- a/web-to-ppt/popup.js
+++ b/web-to-ppt/popup.js
@@ -105,15 +105,16 @@ async function exportPptx() {
     setProgress(90, '正在打包...');
     const blob = await WebToPPT.schemaToPptxBlob(schema);
 
-    // 5. 下载
+    // 5. 下载（不弹对话框，直接下载到默认文件夹）
     setProgress(95, '正在下载...');
     const url = URL.createObjectURL(blob);
     const title = jsonData.source?.title || 'webpage';
     const safeTitle = title.replace(/[\\/:*?"<>|]+/g, '-').replace(/\s+/g, '-').slice(0, 64) || 'webpage';
     const filename = `web-to-ppt/${safeTitle}-${Date.now()}.pptx`;
 
-    await chrome.downloads.download({ url, filename, saveAs: true });
-    URL.revokeObjectURL(url);
+    const downloadId = await chrome.downloads.download({ url, filename });
+    // 等下载完成后再 revoke
+    setTimeout(() => URL.revokeObjectURL(url), 30000);
 
     setProgress(100, `已导出：${filename}`);
     setResult('success', '导出完成');