diff --git a/app/admin_service.py b/app/admin_service.py
index 16e80db..efbaf6d 100644
--- a/app/admin_service.py
+++ b/app/admin_service.py
@@ -126,3 +126,20 @@ def user():
                 update_expiry_time_by_username(username, "".join(expiry_time.split("-")))
                 flash(f'Expiry date updated to {expiry_time}.')
     return render_template("admin_manage_user.html", **context)
+
+
+@adminService.route("/admin/expiry", methods=["GET"])
+def user_expiry_time():
+    is_admin = check_is_admin()
+    if is_admin != "pass":
+        return is_admin
+    
+    username = request.args.get("username", "")
+    if not username:
+        return "Username can't empty"
+    
+    user = get_user_by_username(username)
+    if not user:
+        return "User not exist"
+    
+    return user.expiry_date
\ No newline at end of file
diff --git a/app/model/user.py b/app/model/user.py
index 6c030c2..28173b9 100644
--- a/app/model/user.py
+++ b/app/model/user.py
@@ -5,6 +5,11 @@ def get_users():
     with db_session:
         return User.select().order_by(User.name)[:]
 
+def get_user_by_username(username):
+    with db_session:
+        user = User.select(name=username)
+        if user:
+            return user.first()
 
 def update_password_by_username(username, password="123456"):
     with db_session:
diff --git a/app/templates/admin_manage_user.html b/app/templates/admin_manage_user.html
index 585fc82..a3f0ca0 100644
--- a/app/templates/admin_manage_user.html
+++ b/app/templates/admin_manage_user.html
@@ -82,16 +82,17 @@
     })
     // 选择用户后更新其过期时间
     function loadUserExpiryDate() {
-        let cur_user = $('#username').val();
-        {% for user in user_list %}
-            if (cur_user == "{{ user.name }}") {
-                const dateString = "{{ user.expiry_date }}"
-                const year = dateString.substr(0,4);
-                const month = dateString.substr(4,2);
-                const day = dateString.substr(6,2);
+        const cur_user = $('#username').val();
+        $.ajax({
+            type: "GET",
+            url: `/admin/expiry?username=${cur_user}`,
+            success: function(resp) {
+                const year = resp.substr(0,4);
+                const month = resp.substr(4,2);
+                const day = resp.substr(6,2);
                 document.getElementById("expiry_date").value = year + '-' + month + '-' + day
             }
-        {% endfor %}
+        })
     }
 </script>