diff --git a/db/migrate/20200109062658_create_subject_records.rb b/db/migrate/20200109062658_create_subject_records.rb
index 97741fd8c..b990b8bdc 100644
--- a/db/migrate/20200109062658_create_subject_records.rb
+++ b/db/migrate/20200109062658_create_subject_records.rb
@@ -1,7 +1,7 @@
 class CreateSubjectRecords < ActiveRecord::Migration[5.2]
   def change
     create_table :subject_records do |t|
-      t.references :subject, unique: true
+      t.references :subject
       t.integer :study_count, default: 0
       t.integer :course_study_count, default: 0
       t.integer :initiative_study, default: 0
diff --git a/db/migrate/20200111024736_add_index_for_subject_records.rb b/db/migrate/20200111024736_add_index_for_subject_records.rb
new file mode 100644
index 000000000..c27c9b9ae
--- /dev/null
+++ b/db/migrate/20200111024736_add_index_for_subject_records.rb
@@ -0,0 +1,6 @@
+class AddIndexForSubjectRecords < ActiveRecord::Migration[5.2]
+  def change
+    remove_index :subject_records, :subject_id
+    add_index :subject_records, :subject_id, unique: true
+  end
+end
diff --git a/lib/tasks/statistic_subject_info.rake b/lib/tasks/statistic_subject_info.rake
index 04e6c1195..7eed62b3c 100644
--- a/lib/tasks/statistic_subject_info.rake
+++ b/lib/tasks/statistic_subject_info.rake
@@ -1,36 +1,41 @@
 desc "统计实践课程的学习统计数据"
 
 namespace :subjects do
+  buffer_size = 1000
   task data_statistic: :environment do
     puts("---------------------data_statistic_begin")
     Rails.logger.info("---------------------data_statistic_begin")
     subjects = Subject.where(status: 2)
+    str = ""
+    column_value = "subject_id, study_count, course_study_count, initiative_study, passed_count, course_used_count, " +
+        "school_used_count, created_at, updated_at"
     subjects.find_each do |subject|
       puts("---------------------data_statistic: #{subject.id}")
       Rails.logger.info("---------------------data_statistic: #{subject.id}")
-      sr = SubjectRecord.find_or_create_by!(subject_id: subject.id)
+      #sr = SubjectRecord.find_or_create_by!(subject_id: subject.id)
       data = Subjects::DataStatisticService.new(subject)
       study_count = data.study_count
-      # 总人数没有变化的话，不同课堂之类的变化了
-      course_study_count = (study_count == sr.study_count ? sr.course_study_count : data.course_study_count)
-      passed_count = (study_count == sr.study_count ? sr.passed_count : data.passed_count)
-      course_used_count = (study_count == sr.study_count ? sr.course_used_count : data.course_used_count)
-      school_used_count = (study_count == sr.study_count ? sr.school_used_count : data.school_used_count)
-      unless course_study_count == sr.course_study_count &&
-          passed_count == sr.passed_count &&
-          course_used_count == sr.course_used_count &&
-          school_used_count == sr.school_used_count
-        update_params = {
-            study_count: study_count,
-            course_study_count: course_study_count,
-            initiative_study: (study_count - course_study_count),
-            passed_count: passed_count,
-            course_used_count: course_used_count,
-            school_used_count: school_used_count
-        }
-        sr.update_attributes!(update_params)
+      next if study_count == 0
+      course_study_count = data.course_study_count
+      initiative_study = study_count - course_study_count
+      str += ", " unless str.empty?
+      str += ("(#{subject.id}, #{study_count}, #{course_study_count}, #{initiative_study}, " +
+          "#{data.passed_count}, #{data.course_used_count}, #{data.school_used_count}, " +
+          "'#{Time.now.strftime('%Y-%m-%d %H:%M:%S')}', '#{Time.now.strftime('%Y-%m-%d %H:%M:%S')}')")
+      buffer_size += 1
+      if buffer_size == 1000
+        sql = "REPLACE INTO subject_records(#{column_value}) VALUES #{str}"
+        puts sql
+        ActiveRecord::Base.connection.execute sql
+        str = ""
+        buffer_size = 0
       end
     end
+    if buffer_size > 0
+      sql = "REPLACE INTO subject_records(#{column_value}) VALUES #{str}"
+      puts sql
+      ActiveRecord::Base.connection.execute sql
+    end
     puts("---------------------data_statistic_end")
     Rails.logger.info("---------------------data_statistic_end")
   end