diff --git a/app/controllers/subjects_controller.rb b/app/controllers/subjects_controller.rb
index 8333b080d..36f14a5d5 100644
--- a/app/controllers/subjects_controller.rb
+++ b/app/controllers/subjects_controller.rb
@@ -450,13 +450,13 @@ class SubjectsController < ApplicationController
       @user_tags = []
     else
       pass_challenge_ids = pass_games.map(&:challenge_id).uniq # 按道理是不用去重的，但是历史数据与重复
-      subject_challenge_count = @subject.shixuns.sum(:challenges_count)
+      # subject_challenge_count = @subject.shixuns.sum(:challenges_count)
       # 用户通关获得的标签
       @user_tags = ChallengeTag.where(challenge_id: pass_challenge_ids).pluck(:name)
       # 用户学习进度
       @learned =
-          subject_challenge_count == 0 ? 0 :
-              ((pass_challenge_ids.size.to_f / subject_challenge_count).round(2) * 100).to_i
+        @all_score == 0 ? 0 :
+              ((pass_challenge_ids.size.to_f / @all_score).round(2) * 100).to_i
       # 用户通关分数
       @my_score = Challenge.where(id: pass_challenge_ids).size
       @time = pass_games.map(&:cost_time).sum
diff --git a/app/helpers/courses_helper.rb b/app/helpers/courses_helper.rb
index 6f6c76d04..5ca4eb773 100644
--- a/app/helpers/courses_helper.rb
+++ b/app/helpers/courses_helper.rb
@@ -111,7 +111,7 @@ module CoursesHelper
       when "announcement"
         course.informs.count
       when "online_learning"
-        course.subject&.shixuns_count
+        course.shixuns.count
     end
   end
 
diff --git a/db/migrate/20190911103449_migrate_grade_index.rb b/db/migrate/20190911103449_migrate_grade_index.rb
new file mode 100644
index 000000000..0128619fa
--- /dev/null
+++ b/db/migrate/20190911103449_migrate_grade_index.rb
@@ -0,0 +1,7 @@
+class MigrateGradeIndex < ActiveRecord::Migration[5.2]
+  def change
+    remove_index :grades, [:user_id, :container_id]
+    add_index :grades, [:container_id, :container_type]
+    add_index :grades, [:user_id]
+  end
+end