diff --git a/app/controllers/games_controller.rb b/app/controllers/games_controller.rb
index b83431a82..9c5087399 100644
--- a/app/controllers/games_controller.rb
+++ b/app/controllers/games_controller.rb
@@ -768,7 +768,7 @@ class GamesController < ApplicationController
   # REDO:需要添加详细的说明
   def cost_time
     #return if @game.status >= 2
-    cost_time = (params[:time].to_i < 0 ? 0 : params[:time].to_i) + @game.cost_time.to_i
+    cost_time = params[:time].to_i < @game.cost_time ? (@game.cost_time+params[:time]) : params[:time].to_i
     @game.update_attribute(:cost_time, cost_time)
   end
 
diff --git a/app/views/games/cost_time.json.jbuilder b/app/views/games/cost_time.json.jbuilder
new file mode 100644
index 000000000..76e908307
--- /dev/null
+++ b/app/views/games/cost_time.json.jbuilder
@@ -0,0 +1 @@
+json.identifier @game.identifier
\ No newline at end of file