diff --git a/apps/authentication/utils.py b/apps/authentication/utils.py
index eb1649885..197aa113a 100644
--- a/apps/authentication/utils.py
+++ b/apps/authentication/utils.py
@@ -1,31 +1,20 @@
 # -*- coding: utf-8 -*-
 #
-from django.utils.translation import ugettext as _
 from django.contrib.auth import authenticate
 
-from common.utils import (
-    get_ip_city, get_object_or_none, validate_ip
-)
-from users.models import User
 from . import errors
 
 
 def check_user_valid(**kwargs):
     password = kwargs.pop('password', None)
     public_key = kwargs.pop('public_key', None)
-    email = kwargs.pop('email', None)
     username = kwargs.pop('username', None)
     request = kwargs.get('request')
 
-    if username:
-        user = get_object_or_none(User, username=username)
-    elif email:
-        user = get_object_or_none(User, email=email)
-    else:
-        user = None
-
-    if user is None:
-        return None, errors.reason_user_not_exist
+    user = authenticate(request, username=username,
+                        password=password, public_key=public_key)
+    if not user:
+        return None, errors.reason_password_failed
     elif user.is_expired:
         return None, errors.reason_user_inactive
     elif not user.is_active:
@@ -33,9 +22,4 @@ def check_user_valid(**kwargs):
     elif user.password_has_expired:
         return None, errors.reason_password_expired
 
-    if password or public_key:
-        user = authenticate(request, username=username,
-                            password=password, public_key=public_key)
-        if user:
-            return user, ''
-    return None, errors.reason_password_failed
+    return user, ''