diff --git a/app/views/challenges/_challenges_left_nav.html.erb b/app/views/challenges/_challenges_left_nav.html.erb
index 6d2389bb..2fd25eac 100755
--- a/app/views/challenges/_challenges_left_nav.html.erb
+++ b/app/views/challenges/_challenges_left_nav.html.erb
@@ -1,8 +1,8 @@
 <div class="bor-bottom-greyE clearfix pl20 pr20 pt40 pb20 edu-back-white challengeNav">
   <a href="<%= shixun_challenges_url(@shixun) %>" class="<%= params[:action] == "index" ? "active" : "" %> fl mr40">任务</a>
-  <% if @shixun.propaedeutics.present? %>
-    <a href="<%= propaedeutics_shixun_path(@shixun) %>" class="<%= params[:action] == "propaedeutics" ? "active" : "" %> fl mr40">背景知识</a>
-  <% end %>
+  <%# if @shixun.propaedeutics.present? %>
+    <a href="<%#= propaedeutics_shixun_path(@shixun) %>" class="<%= params[:action] == "propaedeutics" ? "active" : "" %> fl mr40">背景知识</a>
+  <%# end %>
   <% if User.current.manager_of_shixun?(@shixun) %>
     <%= link_to l(:project_module_repository),
                   ({:controller => 'repositories',
diff --git a/app/views/challenges/_content_list.html.erb b/app/views/challenges/_content_list.html.erb
index deb76d8a..42a478c6 100755
--- a/app/views/challenges/_content_list.html.erb
+++ b/app/views/challenges/_content_list.html.erb
@@ -13,7 +13,7 @@
       <% end %>
     </p>
     <div class="justify break_full_word new_li mb50" id="challenge_editorMd_description">
-      <textarea style="display:none;"><%= @shixun.description %></textarea>
+      <textarea style="display:none;"><%#= @shixun.description %></textarea>
     </div>
     <p class="clearfix mb10">
       <span class="font-16 fl">全部任务</span>
diff --git a/db/migrate/20190521005354_add_shixun_members_for_shixuns.rb b/db/migrate/20190521005354_add_shixun_members_for_shixuns.rb
new file mode 100644
index 00000000..facdb16a
--- /dev/null
+++ b/db/migrate/20190521005354_add_shixun_members_for_shixuns.rb
@@ -0,0 +1,58 @@
+
+class AddShixunMembersForShixuns < ActiveRecord::Migration
+  def up
+    ActiveRecord::Base.transaction do
+      begin
+        # 添加实训合作的用户
+        mail = ["358551898@qq.com", "a358551898@163.com"]   #修改这里
+        user_ids = User.where(mail: mail).pluck(:id)
+        if mail.count != user_ids.count
+          raise("添加的用户人数与平台不一致，请检查邮箱")
+        end
+         # identifiers = ["yzi73hov", "rtl4hfjm", "7brio4fn", "ljqz2xft", "jps8tzi7", "su3j58cm", "k6842ose", "nvzi5xbo",
+         #                "j9aq3lbi", "3xovlgp5", "z6ve4afx", "93porv58", "e8surftc", "eirw5n2m", "pnvbt2aj", "t2mi45rf",
+         #                "gflejmqb", "fsaz9pu8", "3siy4fca", "jzpycn4f", "nlebmku2", "npbso5fc", "96wxjrob", "s2gxjuet",
+         #                "3o5qyha4", "bt2ipsmv", "9fls43hx", "yxcs79vp", "59gi4cvy", "oj3wrmty", "wpsc7nli", "fiyvtqp8",
+         #                "2wuo9ykb", "45uqw3se", "ugrq4p83", "vkgn8cfy", "avgffhtb"]
+        shixuns = Shixun.includes(challenges: [:test_sets, :challenge_tags]).where("shixuns.name like '%期末%'")
+        shixuns.each do |shixun|
+          if shixun.shixun_members.blank?
+            ShixunMember.create!(user_id: shixun.user_id, shixun_id: shixun.id, role: 1)
+          end
+          user_ids.each do |user_id|
+            unless shixun.shixun_members.pluck(:user_id).include?(user_id)
+              ShixunMember.create!(user_id: user_id, shixun_id: shixun.id, role: 2)
+            end
+          end
+          把测试集设置成按均分比例
+          shixun.challenges.update_all(test_set_score: true)
+          shixun.challenges.each do |challenge|
+            all_score = 0
+            set_count = challenge.test_sets.count
+            raise("测试集的个数不能为0") if set_count == 0
+            score = (100 / set_count).to_i
+            challenge.test_sets.each_with_index do |test_set, index|
+              # 如果是最后一个测试集，则把剩下的分数全给你它
+              if index+1 == set_count
+                score = 100 - all_score
+              end
+              test_set.update_column(:score, score)
+              all_score += score
+            end
+            # 增加标签
+            unless challenge.challenge_tags.pluck(:name).include?("2019上半年C语言期末考试题库")
+              ChallengeTag.create!(name: "2019上半年C语言期末考试题库", challenge_id: challenge.id)
+            end
+          end
+        end
+
+      rescue Exception => e
+        puts "#########error_message: ##{e.message}"
+        raise ActiveRecord::Rollback
+      end
+    end
+  end
+
+  def down
+  end
+end