diff --git a/app/controllers/games_controller.rb b/app/controllers/games_controller.rb
index 1a6fe8ac7..23c72c5dc 100644
--- a/app/controllers/games_controller.rb
+++ b/app/controllers/games_controller.rb
@@ -769,7 +769,7 @@ class GamesController < ApplicationController
   def cost_time
     #return if @game.status >= 2
     cost_time = (Time.now.to_i - @game.play_time.to_i) + @game.cost_time.to_i
-    @game.update_attributes(play_time: Time.now, cost_time: cost_time, play_sign: 0)
+    @game.update_attributes(cost_time: cost_time, play_sign: 0)
   end
 
   # 同步challenge的更新时间
diff --git a/app/models/game.rb b/app/models/game.rb
index 7aa2e7264..d82392a59 100644
--- a/app/models/game.rb
+++ b/app/models/game.rb
@@ -3,7 +3,7 @@
 # modify_time： 与challenges表的modify_time联合使用，2个字段一致，则标识测试集未修改，反之，被修改
 # answer_open: 查看查看答案的深度, 0: 未查看过答案, 其他数值与challenge_answer的level值相关
 # answer_deduction: 查看答案扣分的百分比;如 查看答案 扣除70%
-#
+#play_sign 与play_time: sign记录浏览器是否正常关闭， 0表示正常，1表示非正常； play_time：表示游玩时间
 class Game < ApplicationRecord
   default_scope { order("games.created_at desc") }