diff --git a/app/controllers/challenges_controller.rb b/app/controllers/challenges_controller.rb
index 54f545e5..5bd8f537 100644
--- a/app/controllers/challenges_controller.rb
+++ b/app/controllers/challenges_controller.rb
@@ -465,7 +465,7 @@ class ChallengesController < ApplicationController
       render_404
       return
     else
-      if (@shixun.status == 0 && !User.current.manager_of_shixun?(@shixun))
+      if (@shixun.status == 0 && !User.current.manager_of_shixun?(@shixun)) || @shixun.status == -1
         render_403
         return
       end
diff --git a/app/controllers/managements_controller.rb b/app/controllers/managements_controller.rb
index d5e8c682..0d17ccf6 100644
--- a/app/controllers/managements_controller.rb
+++ b/app/controllers/managements_controller.rb
@@ -158,7 +158,7 @@ class ManagementsController < ApplicationController
     @sub_type = 8
     @g = Gitlab.client
     if params[:search]
-      myshixun_id = Game.where(:identifier => params[:search]).pluck(:myshixun_id)
+      myshixun_id = Game.where("identifier = #{params[:search]} or id = #{params[:search]}").pluck(:myshixun_id)
       @myshixuns = Myshixun.where(:id => myshixun_id).includes(:shixun)
     else
       @myshixuns = Myshixun.where("0=0").includes(:shixun)
diff --git a/app/controllers/shixuns_controller.rb b/app/controllers/shixuns_controller.rb
index 2f07b182..83ec54f8 100644
--- a/app/controllers/shixuns_controller.rb
+++ b/app/controllers/shixuns_controller.rb
@@ -1115,8 +1115,8 @@ class ShixunsController < ApplicationController
       g.delete_project(@shixun.gpid) if @shixun.try(:gpid).present?
       apply_record = ApplyAction.where(:container_id => @shixun.id, :container_type => "ApplyShixun")
       apply_record.delete_all if apply_record
-      HomeworkCommonsShixuns.where(:shixun_id => @shixun).delete_all # 关联删报错，后续解决
-      @shixun.destroy
+      #HomeworkCommonsShixuns.where(:shixun_id => @shixun).delete_all # 关联删报错，后续解决
+      @shixun.update_attribute(:status, -1)
       respond_to do |format|
         if params[:come_from] == "admin"
           format.html{ redirect_to shixuns_managements_path }
@@ -1215,7 +1215,7 @@ class ShixunsController < ApplicationController
   # Find shixun of id params[:id]
   def find_shixun
     @shixun = Shixun.find_by_identifier(params[:id])
-    render_404 if @shixun.nil?
+    render_404 if @shixun.nil? || @shixun.status == -1
   rescue ActiveRecord::RecordNotFound
     render_404
   end
@@ -1362,4 +1362,8 @@ class ShixunsController < ApplicationController
   def validation_email
     render_403 if User.current.mail.blank?
   end
+
+  def validate_shixun
+
+  end
 end
diff --git a/app/models/shixun.rb b/app/models/shixun.rb
index 0a7fff62..6ab98172 100644
--- a/app/models/shixun.rb
+++ b/app/models/shixun.rb
@@ -73,7 +73,7 @@ class Shixun < ActiveRecord::Base
   end
 
   def fork_identifier
-    self.fork_from.nil? ? "--" : Shixun.find(self.fork_from).try(:identifier)
+    self.fork_from.nil? ? "--" : Shixun.where(id: self.fork_from).first.try(:identifier)
   end
 
   def get_fork
diff --git a/db/migrate/20190401011345_modify_fork_from_for_shixuns.rb b/db/migrate/20190401011345_modify_fork_from_for_shixuns.rb
new file mode 100644
index 00000000..98dc7c1e
--- /dev/null
+++ b/db/migrate/20190401011345_modify_fork_from_for_shixuns.rb
@@ -0,0 +1,11 @@
+class ModifyForkFromForShixuns < ActiveRecord::Migration
+  def up
+    shixuns = Shixun.where(:fork_from => 1933)
+    shixuns.each do |shixun|
+      shixun.update_attribute(:fork_from, nil)
+    end
+  end
+
+  def down
+  end
+end