diff --git a/dsLightRag/static/xnfzsy_nlsh.html b/dsLightRag/static/xnfzsy_nlsh.html
index dcc803dd..7277f89a 100644
--- a/dsLightRag/static/xnfzsy_nlsh.html
+++ b/dsLightRag/static/xnfzsy_nlsh.html
@@ -165,7 +165,7 @@
 <body>
     <div class="container">
         <div class="simulation-panel">
-            <iframe src="https://phet.colorado.edu/sims/html/circuit-construction-kit-ac-virtual-lab/latest/circuit-construction-kit-ac-virtual-lab_all.html?locale=zh_CN"></iframe>
+            <iframe src="https://phet.colorado.edu/sims/html/collision-lab/latest/collision-lab_all.html?locale=zh_CN"></iframe>
         </div>
         <div class="chat-panel">
             <div class="chat-header">AI 助手</div>
