diff --git a/app/controller/admin/Login.php b/app/controller/admin/Login.php
index 5077958..5388df4 100644
--- a/app/controller/admin/Login.php
+++ b/app/controller/admin/Login.php
@@ -96,8 +96,12 @@ class Login extends Base {
                 return $this->buildFailed(ReturnCode::LOGIN_ERROR, '用户已被封禁，请联系管理员');
             }
         } else {
-            $this->setFailKey($username);
-            return $this->buildFailed(ReturnCode::LOGIN_ERROR, '用户名密码不正确');
+            $count = $this->setFailKey($username);
+            return $this->buildFailed(
+                ReturnCode::LOGIN_ERROR,
+                '用户名密码不正确',
+                ['need_captcha' => $count >= $this->captchaThreshold]
+            );
         }
         $userInfo['access'] = $this->getAccess($userInfo['id']);
         $userInfo['menu'] = $this->getAccessMenuData($userInfo['id']);
@@ -221,15 +225,13 @@ class Login extends Base {
         ]);
     }
 
-    protected function captchaCheck($username, $captchaToken, $captchaInput)
-    {
-    }
-
     protected function setFailKey($username)
     {
         $failKey = "login:fail:{$username}";
         $failCount = (int) Cache::get($failKey, 0);
-        Cache::set($failKey, $failCount + 1, $this->lockMinutes * 60);
+        $failCount += 1;
+        Cache::set($failKey, $failCount, $this->lockMinutes * 60);
+        return $failCount;
     }
 
     /**