diff --git a/src/agentkit/server/static/index.html b/src/agentkit/server/static/index.html
index a1f84a6..0267cd5 100644
--- a/src/agentkit/server/static/index.html
+++ b/src/agentkit/server/static/index.html
@@ -211,7 +211,7 @@ html,body{height:100%;font-family:var(--font);background:var(--bg);color:var(--t
     </div>
     <div class="input-area">
       <div class="input-wrap">
-        <textarea id="input" rows="1" placeholder="输入消息..." onkeydown="handleKey(event)" oninput="autoResize(this)" oncompositionstart="inputComposing=true" oncompositionend="inputComposing=false"></textarea>
+        <textarea id="input" rows="1" placeholder="输入消息..." onkeydown="handleKey(event)" oninput="autoResize(this)"></textarea>
         <button class="btn-send" id="sendBtn" onclick="sendMessage()">发送</button>
       </div>
     </div>
@@ -466,10 +466,9 @@ async function sendMessage() {
   updateSendBtn();
 }
 
-let inputComposing = false;
-
 function handleKey(e) {
-  if (e.key === 'Enter' && !e.shiftKey && !inputComposing) {
+  // e.isComposing is true during IME composition — don't submit then
+  if (e.key === 'Enter' && !e.shiftKey && !e.isComposing) {
     e.preventDefault();
     sendMessage();
   }