diff --git a/app/models/user.rb b/app/models/user.rb
index 2ae3083d..6138f9b5 100644
--- a/app/models/user.rb
+++ b/app/models/user.rb
@@ -577,15 +577,16 @@ class User < Principal
   # Find a user account by matching the exact login and then a case-insensitive
   # version.  Exact matches will be given priority.
   #通过用户名查找相应的用户，若没有匹配到，则不区分大小写进行查询
+  #修改：不再匹配不区分大小写情况 -zjc
   def self.find_by_login(login)
     if login.present?
       login = login.to_s
       # First look for an exact match
       user = where(:login => login).all.detect {|u| u.login == login}
-      unless user
-        # Fail over to case-insensitive if none was found
-        user = where("LOWER(login) = ?", login.downcase).first
-      end
+      #unless user
+      #  # Fail over to case-insensitive if none was found
+      #  user = where("LOWER(login) = ?", login.downcase).first
+      #end
       user
     end
   end