diff --git a/db/migrate/20190426010412_add_is_invalid_to_student_works_scores.rb b/db/migrate/20190426010412_add_is_invalid_to_student_works_scores.rb
index 2d782f924..7b893db6d 100644
--- a/db/migrate/20190426010412_add_is_invalid_to_student_works_scores.rb
+++ b/db/migrate/20190426010412_add_is_invalid_to_student_works_scores.rb
@@ -1,6 +1,6 @@
 class AddIsInvalidToStudentWorksScores < ActiveRecord::Migration[5.2]
   def change
-    add_column :student_works_scores, :is_invalid, :boolean, default: false
+    # add_column :student_works_scores, :is_invalid, :boolean, default: false
 
     StudentWorksScore.where("score is not null").order("id desc").find_each do |score|
       unless score.is_invalid
diff --git a/db/migrate/20190517092730_add_description_to_edu_settings.rb b/db/migrate/20190517092730_add_description_to_edu_settings.rb
index ad273b805..c8f54ca31 100644
--- a/db/migrate/20190517092730_add_description_to_edu_settings.rb
+++ b/db/migrate/20190517092730_add_description_to_edu_settings.rb
@@ -1,7 +1,7 @@
 class AddDescriptionToEduSettings < ActiveRecord::Migration[5.2]
   def change
-    add_column :edu_settings, :description, :string
-    add_index :edu_settings, :name, unique: :true
+    # add_column :edu_settings, :description, :string
+    # add_index :edu_settings, :name, unique: :true
 
     ['tomcat_webssh', 'webssh_username', 'webssh_password', 'git_address_ip', 'git_address_domain', 'git_username',
     'git_password', 'public_key', 'private_key', 'public_bucket', 'public_bucket_host', 'public_cdn_host', 'cloud_bridge',
diff --git a/db/migrate/20190613022158_add_exec_time_to_challenge.rb b/db/migrate/20190613022158_add_exec_time_to_challenge.rb
index c1743674c..8998b3d82 100644
--- a/db/migrate/20190613022158_add_exec_time_to_challenge.rb
+++ b/db/migrate/20190613022158_add_exec_time_to_challenge.rb
@@ -1,6 +1,6 @@
 class AddExecTimeToChallenge < ActiveRecord::Migration[5.2]
   def change
-    add_column :challenges, :exec_time, :integer
+    # add_column :challenges, :exec_time, :integer
 
     Shixun.find_each do |shixun|
       shixun.challenges.update_all(exec_time: shixun.exec_time)