diff --git a/app/controllers/games_controller.rb b/app/controllers/games_controller.rb
index b2de6dcad..667d45f2b 100644
--- a/app/controllers/games_controller.rb
+++ b/app/controllers/games_controller.rb
@@ -116,7 +116,7 @@ class GamesController < ApplicationController
       @qrcode_str = Base64.encode64( qr.to_img.resize(400,400).to_s )
 
     else
-      @type = "image"
+      @type = ""
       #conv = Iconv.new("GBK", "utf-8")
       @game_challenge = @game.challenge
       type = @game_challenge.show_type
diff --git a/app/controllers/myshixuns_controller.rb b/app/controllers/myshixuns_controller.rb
index fa47fd7f6..1d6b15969 100644
--- a/app/controllers/myshixuns_controller.rb
+++ b/app/controllers/myshixuns_controller.rb
@@ -24,7 +24,7 @@ class MyshixunsController < ApplicationController
       ActiveRecord::Base.transaction do
         begin
           @shixun = Shixun.select(:id, :identifier).find(@myshixun.shixun_id)
-          @myshixun.destroy
+          @myshixun.destroy!
 
           StudentWork.where(:myshixun_id => @myshixun.id).update_all(:myshixun_id => 0, :work_status => 0)
 
diff --git a/app/helpers/games_helper.rb b/app/helpers/games_helper.rb
index aff05904f..dfc3fb321 100644
--- a/app/helpers/games_helper.rb
+++ b/app/helpers/games_helper.rb
@@ -6,7 +6,7 @@ module GamesHelper
   end
 
   # 获取目录下所有文件，返回一个文件名的数组 type是查看文件的类型image表示图片
-  # type [[1, "图片"], [2, "apk/exe"], [3, "txt"], [4, "html"]]
+  # type [[1, "图片"], [2, "apk/exe"], [3, "txt"], [4, "html"], [5, "mp3"], [6, "mp4"]]
   def get_dir_filename(path, type, game_id)
     answer_picture = []
     return answer_picture unless File.directory?(path)
@@ -39,6 +39,12 @@ module GamesHelper
         end
         f.close
         @type = 'txt'
+      elsif extension == 'mp3' && type == 5
+        answer_picture << file
+        @type = 'mp3'
+      elsif extension == 'mp4' && type == 6
+        answer_picture << file
+        @type = 'mp4'
       end
     end
 
diff --git a/app/models/challenge.rb b/app/models/challenge.rb
index 0bea54eb4..8e4d2ae42 100644
--- a/app/models/challenge.rb
+++ b/app/models/challenge.rb
@@ -1,5 +1,6 @@
 class Challenge < ApplicationRecord
   # difficulty: 关卡难度: 1.简单 2.中等 3.困难
+  # show_type: 效果展示：-1.无效果 1.图片 2.apk/exe 3.txt 4.html 5.mp3 6.mp4
   default_scope { order("challenges.position asc") }
 
   belongs_to :shixun, :touch => true, counter_cache: true