diff --git a/web/src/App.tsx b/web/src/App.tsx
index 09f4f505..b957e226 100644
--- a/web/src/App.tsx
+++ b/web/src/App.tsx
@@ -790,32 +790,44 @@ export default function App() {
   }, [activeSessionId]);
 
   // 监听 URL 哈希 (#/s/{sessionId}/m/{messageId}) 实现深链接直接定位与脉冲动效
+  const activeSessionIdRef = useRef(activeSessionId);
+  useEffect(() => {
+    activeSessionIdRef.current = activeSessionId;
+  }, [activeSessionId]);
+
+  const loadDayForAnchorRef = useRef(chatWindow.loadDayForAnchor);
+  useEffect(() => {
+    loadDayForAnchorRef.current = chatWindow.loadDayForAnchor;
+  }, [chatWindow.loadDayForAnchor]);
+
   useEffect(() => {
     const handleHashChange = () => {
       const parsed = parseAnchorHash(window.location.hash);
       if (!parsed) return;
-      if (parsed.sessionId && parsed.sessionId !== activeSessionId) {
+      const currentActive = activeSessionIdRef.current;
+      if (parsed.sessionId && parsed.sessionId !== currentActive) {
         setActiveSessionId(parsed.sessionId);
         setTimeout(() => {
           navigateToAnchor(parsed, {
             sessionId: parsed.sessionId,
-            loadDayForAnchor: chatWindow.loadDayForAnchor,
+            loadDayForAnchor: loadDayForAnchorRef.current,
           });
         }, 300);
       } else {
         navigateToAnchor(parsed, {
-          sessionId: activeSessionId,
-          loadDayForAnchor: chatWindow.loadDayForAnchor,
+          sessionId: currentActive,
+          loadDayForAnchor: loadDayForAnchorRef.current,
         });
       }
     };
 
     window.addEventListener('hashchange', handleHashChange);
+    // 仅在初始页面加载时检查一次 URL hash
     if (window.location.hash) {
       handleHashChange();
     }
     return () => window.removeEventListener('hashchange', handleHashChange);
-  }, [activeSessionId, chatWindow.loadDayForAnchor]);
+  }, []); // 仅在挂载时监听 hashchange，避免 activeSessionId 变更时因残留 hash 产生回弹
 
   // 引用消息交互
   const handleQuoteMessage = (message: ChatMessage) => {
@@ -1866,7 +1878,13 @@ export default function App() {
       <AppShell
         sessions={sessions}
         activeSessionId={activeSessionId}
-        onSelectSession={setActiveSessionId}
+        onSelectSession={(sessId) => {
+          // 切换项目时清理旧会话的残留锚点 hash，防止回弹
+          if (window.location.hash) {
+            history.replaceState(null, '', window.location.pathname + window.location.search);
+          }
+          setActiveSessionId(sessId);
+        }}
         onNewSession={() => {
           const newSessId = 'sess-' + Date.now();
           const newProjId = Date.now();