diff --git a/apps/web/src/pages/editing-planner/components/TimelinePanel.tsx b/apps/web/src/pages/editing-planner/components/TimelinePanel.tsx
index bc59991a4..867cb6abb 100755
--- a/apps/web/src/pages/editing-planner/components/TimelinePanel.tsx
+++ b/apps/web/src/pages/editing-planner/components/TimelinePanel.tsx
@@ -66,6 +66,13 @@ const TimelinePanel: React.FC<TimelinePanelProps> = ({
         ? ["pip"]
         : ["voice", "pip"]; // voice_pip 或默认
 
+ 
+  /* ── 模式切换时自动更新默认添加类型 ── */
+  useEffect(() => {
+    if (!availableTypes.includes(addType)) {
+      setAddType(availableTypes[0]);
+    }
+  }, [currentMode]);
   /* ── 面板尺寸（宽度固定，高度由 useLayoutEffect 实测） ── */
   const PICKER_W = 240; // 面板宽度（与 CSS 一致）
   const GAP = 6; // 面板与"+"卡片的间距