diff --git a/db/migrate/20190805010550_modify_ke_contents_for_markdown.rb b/db/migrate/20190805010550_modify_ke_contents_for_markdown.rb
index 4b8c2e5bd..53c018b8b 100644
--- a/db/migrate/20190805010550_modify_ke_contents_for_markdown.rb
+++ b/db/migrate/20190805010550_modify_ke_contents_for_markdown.rb
@@ -1,12 +1,12 @@
 class ModifyKeContentsForMarkdown < ActiveRecord::Migration[5.2]
   include ActionView::Helpers::SanitizeHelper
   def change
-    def ke_transform_to_md content
-      return content if content.blank?
-      s_contents = sanitize(content, tags: %w(img a span table td tr tbody pre), attributes: %w(src href target style))
-      s_contents.gsub(">\n<", "><").gsub(/^\n/, "").gsub(" ", "&nbsp;").gsub(/(\n)+/, "<br />")
-          .gsub("\t", "&nbsp;&nbsp;&nbsp;&nbsp;").gsub("\n", "").gsub(" ", "&nbsp;").gsub(/(<br\s?\/?>)+/, "<br />")
-    end
+    # def ke_transform_to_md content
+    #   return content if content.blank?
+    #   s_contents = sanitize(content, tags: %w(img a span table td tr tbody pre), attributes: %w(src href target style))
+    #   s_contents.gsub(">\n<", "><").gsub(/^\n/, "").gsub(" ", "&nbsp;").gsub(/(\n)+/, "<br />")
+    #       .gsub("\t", "&nbsp;&nbsp;&nbsp;&nbsp;").gsub("\n", "").gsub(" ", "&nbsp;").gsub(/(<br\s?\/?>)+/, "<br />")
+    # end
     #
     # # 课程讨论区
     # MessageDetail.find_each do |m|
@@ -15,10 +15,10 @@ class ModifyKeContentsForMarkdown < ActiveRecord::Migration[5.2]
     # end
 
     # 试卷的标题
-    ExerciseQuestion.find_each do |eq|
-      question_title = ke_transform_to_md eq.question_title
-      eq.update_column(:question_title, question_title)
-    end
+    # ExerciseQuestion.find_each do |eq|
+    #   question_title = ke_transform_to_md eq.question_title
+    #   eq.update_column(:question_title, question_title)
+    # end
 
     # # 试卷的答案
     # ExerciseStandardAnswer.find_each do |esa|