diff --git a/www/app.js b/www/app.js
index 1a3c758..42e311c 100644
--- a/www/app.js
+++ b/www/app.js
@@ -410,6 +410,11 @@ function clearCurrentChat() {
 function renderMessages() {
   if (!currentConversation) return;
   
+  // 根据消息数量显示/隐藏欢迎界面
+  if (welcome) {
+    welcome.style.display = currentConversation.messages.length > 0 ? 'none' : 'block';
+  }
+  
   messagesDiv.innerHTML = currentConversation.messages.map((msg, index) => {
     const isUser = msg.role === 'user';
     const avatar = isUser ? '👤' : '🤖';