diff --git a/app/static/app.js b/app/static/app.js
index 8562f47..6be0e0d 100644
--- a/app/static/app.js
+++ b/app/static/app.js
@@ -1,13 +1,11 @@
 // 状态
 let currentUser = "";
 let conversations = [];
-
 let currentKfid = "";
 
 // 初始化
 document.addEventListener("DOMContentLoaded", () => {
     fetchAccounts();
-    loadConversations();
 });
 
 // Toast
@@ -20,35 +18,48 @@ function showToast(msg, type = "success") {
     setTimeout(() => { el.style.opacity = "0"; setTimeout(() => el.style.display = "none", 300); }, 2000);
 }
 
-// 获取客服账号列表
+// 获取客服账号列表，填充下拉框
 async function fetchAccounts() {
+    const select = document.getElementById("accountSelect");
+    select.innerHTML = '<option value="">加载中...</option>';
     try {
         const resp = await fetch("/api/accounts");
         const data = await resp.json();
-        const el = document.getElementById("currentKfid");
         if (data.errcode === 0 && data.account_list && data.account_list.length > 0) {
             const accounts = data.account_list;
+            select.innerHTML = accounts.map((a, i) =>
+                `<option value="${a.open_kfid}" ${i === 0 ? 'selected' : ''}>${a.name || a.open_kfid}</option>`
+            ).join("");
             currentKfid = accounts[0].open_kfid;
-            el.textContent = currentKfid;
-            el.style.color = "#07c160";
-            if (accounts.length > 1) {
-                showToast(`共 ${accounts.length} 个客服账号，默认使用: ${accounts[0].name || currentKfid}`);
-            }
+            showToast(`已加载 ${accounts.length} 个客服账号`);
+            // 自动加载会话
+            loadConversations();
         } else {
-            el.textContent = "获取失败";
-            el.style.color = "#f44336";
-            showToast("获取账号列表失败: " + (data.errmsg || "未知"), "error");
+            select.innerHTML = '<option value="">获取失败</option>';
+            showToast("获取账号列表失败: " + (data.errmsg || "未知错误"), "error");
         }
     } catch (e) {
-        document.getElementById("currentKfid").textContent = "请求失败";
+        select.innerHTML = '<option value="">请求失败</option>';
         showToast("获取账号列表失败: " + e.message, "error");
     }
 }
 
+function onAccountChange() {
+    const select = document.getElementById("accountSelect");
+    currentKfid = select.value;
+    if (currentKfid) {
+        currentUser = "";
+        document.getElementById("msgHeader").textContent = "请选择会话";
+        document.getElementById("messageList").innerHTML = '<div class="empty-state">选择左侧会话查看消息</div>';
+        document.getElementById("sendBtn").disabled = true;
+        loadConversations();
+    }
+}
+
 // 加载会话列表
 async function loadConversations() {
     try {
-        const resp = await fetch("/api/conversations");
+        const resp = await fetch("/api/conversations?open_kfid=" + encodeURIComponent(currentKfid));
         const data = await resp.json();
         conversations = data.conversations || [];
         renderConversations();
@@ -91,7 +102,7 @@ async function selectConversation(userid) {
 // 加载消息
 async function loadMessages(userid) {
     try {
-        const resp = await fetch(`/api/messages?external_userid=${userid}`);
+        const resp = await fetch(`/api/messages?external_userid=${userid}&open_kfid=${encodeURIComponent(currentKfid)}`);
         const data = await resp.json();
         const msgs = data.messages || [];
         renderMessages(msgs);
@@ -131,7 +142,7 @@ async function sendMessage() {
         const resp = await fetch("/api/send", {
             method: "POST",
             headers: { "Content-Type": "application/json" },
-            body: JSON.stringify({ external_userid: currentUser, content }),
+            body: JSON.stringify({ external_userid: currentUser, content, open_kfid: currentKfid }),
         });
         const result = await resp.json();
         if (result.errcode === 0) {
diff --git a/app/templates/index.html b/app/templates/index.html
index d65ff0a..35bb4f4 100644
--- a/app/templates/index.html
+++ b/app/templates/index.html
@@ -54,11 +54,13 @@
     <div class="sidebar">
         <div class="sidebar-header">
             <h2>会话列表</h2>
-            <div style="margin-bottom:6px;font-size:12px;color:#888;">
-                KFID: <span id="currentKfid">...</span>
+            <div style="margin-bottom:6px;">
+                <button onclick="fetchAccounts()" style="background:#576b95;">加载账号</button>
+                <select id="accountSelect" style="margin-left:4px;padding:4px 8px;font-size:12px;max-width:180px;" onchange="onAccountChange()">
+                    <option value="">请先加载账号</option>
+                </select>
             </div>
             <button onclick="syncMessages()">同步拉取</button>
-            <button onclick="fetchAccounts()" style="background:#576b95;margin-left:4px;">查账号</button>
             <span id="syncStatus" style="font-size:12px;color:#888;margin-left:8px;"></span>
         </div>
         <div class="conversation-list" id="conversationList"></div>
@@ -75,6 +77,6 @@
         </div>
     </div>
     <div class="toast" id="toast" style="display:none;"></div>
-    <script src="/static/app.js?v=2"></script>
+    <script src="/static/app.js?v=3"></script>
 </body>
 </html>