diff --git a/db/migrate/20190507061235_migrate_exercise_quetsion_score.rb b/db/migrate/20190507061235_migrate_exercise_quetsion_score.rb
new file mode 100644
index 00000000..89a5dff3
--- /dev/null
+++ b/db/migrate/20190507061235_migrate_exercise_quetsion_score.rb
@@ -0,0 +1,8 @@
+class MigrateExerciseQuetsionScore < ActiveRecord::Migration
+  def up
+    change_column :exercise_shixun_challenges, :question_score, :float, default: 0
+  end
+
+  def down
+  end
+end