diff --git a/manual_trading_hub/static/app.js b/manual_trading_hub/static/app.js
index 943c418..28f61ab 100644
--- a/manual_trading_hub/static/app.js
+++ b/manual_trading_hub/static/app.js
@@ -29,18 +29,10 @@
     }
   }
 
-  function delegateInstanceToParent(url, title, exchangeId, nextPath) {
+  /** 在 LocalNav 等父页 iframe 内：直接替换本 iframe 地址，避免 postMessage / 三层嵌套 */
+  function openInstanceInParentFrame(url) {
     try {
-      window.parent.postMessage(
-        {
-          type: "hub:open-instance",
-          url,
-          title: title || "实例",
-          exchangeId: String(exchangeId),
-          nextPath: nextPath || "/",
-        },
-        "*"
-      );
+      window.location.assign(url);
       return true;
     } catch (_) {
       return false;
@@ -71,8 +63,8 @@
       const row = lastMonitorRows.find((x) => String(x.id) === String(exchangeId));
       const title = row ? row.name : exchangeId;
       instanceFrameCtx = { exchangeId: String(exchangeId), nextPath: next, title };
-      if (isHubEmbedded() && delegateInstanceToParent(url, title, exchangeId, next)) {
-        return;
+      if (isHubEmbedded()) {
+        if (openInstanceInParentFrame(url)) return;
       }
       openInstanceFrame(url, title);
     } catch (e) {
diff --git a/manual_trading_hub/static/index.html b/manual_trading_hub/static/index.html
index dbbf05b..b38f45b 100644
--- a/manual_trading_hub/static/index.html
+++ b/manual_trading_hub/static/index.html
@@ -120,6 +120,6 @@
   </div>
 
   <div id="toast"></div>
-  <script src="/assets/app.js?v=20260530-hub-nav-delegate"></script>
+  <script src="/assets/app.js?v=20260530-hub-embed-nav"></script>
 </body>
 </html>