diff --git a/src/renderer/App.tsx b/src/renderer/App.tsx
index f3b2f6e..b3e4936 100644
--- a/src/renderer/App.tsx
+++ b/src/renderer/App.tsx
@@ -76,6 +76,13 @@ export default function App() {
     return () => window.removeEventListener('file-externally-modified', handler)
   }, [getActiveTab])
 
+  // 切换标签时通知主进程更新窗口标题
+  useEffect(() => {
+    if (!window.electronAPI) return
+    const activeTab = tabs.find(t => t.id === activeTabId)
+    window.electronAPI.tabSwitched(activeTab?.filePath ?? null)
+  }, [activeTabId, tabs])
+
   // 打开文件
   const handleOpenFile = useCallback(async () => {
     if (window.electronAPI) {