diff --git a/app/models/challenge.rb b/app/models/challenge.rb
index 6f4cccfd..704fffb3 100644
--- a/app/models/challenge.rb
+++ b/app/models/challenge.rb
@@ -25,11 +25,11 @@ class Challenge < ActiveRecord::Base
   scope :practice_type, lambda{where(st: 0)}
 
   def shixun_done_new
-    self.games.map{|game| game.status == 2 }.size
+    self.games.select{|game| game.status == 2 }.size
   end
 
   def shixun_running_new
-    self.games.map{|game| game.status != 2 }.size
+    self.games.select{|game| game.status != 2 }.size
   end
 
   def game_difficulty