diff --git a/app/services/courses_service.rb b/app/services/courses_service.rb
index e8b0b6a5e..1439f961d 100644
--- a/app/services/courses_service.rb
+++ b/app/services/courses_service.rb
@@ -700,12 +700,12 @@ class CoursesService
       latest_course_dynamics.sort! { |order, newer| newer[:time] <=> order[:time] }
       # 课程学霸 学生总分数排名靠前的5个人
       homework_count = course.homework_commons.count
-      sql = "select users.*,sum(IFNULL(0,student_works.final_score))/#{homework_count} score from student_works left outer join users on student_works.user_id = users.id" <<
-          " where  homework_common_id in ( select id from homework_commons where homework_commons.course_id = #{course.id}) GROUP BY student_works.user_id ORDER BY score limit 0,4"
+      sql = "select users.*,ROUND(sum(student_works.final_score),2) score from student_works left outer join users on student_works.user_id = users.id" <<
+          " where  homework_common_id in ( select id from homework_commons where homework_commons.course_id = #{course.id}) GROUP BY student_works.user_id ORDER BY score desc limit 0,4"
       better_students = User.find_by_sql(sql)
       # 找出在课程讨论区发帖回帖数最多的
       active_students = []
-      sql1 = " select users.*,count(author_id) active_count from messages " <<
+      sql1 = " select users.*,count(author_id)*2 active_count from messages " <<
           " LEFT JOIN users on messages.author_id = users.id " <<
           " where messages.board_id in (select id from boards where boards.course_id = #{course.id} ) " <<
           " GROUP BY messages.author_id ORDER BY count(author_id) desc " <<
@@ -735,7 +735,7 @@ class CoursesService
     max_size = 0
     if params[:type] == 1
 
-      sql = "select users.*,sum(student_works.final_score) score from student_works left outer join users on student_works.user_id = users.id" <<
+      sql = "select users.*,ROUND(sum(student_works.final_score),2) score from student_works left outer join users on student_works.user_id = users.id" <<
           " where  homework_common_id in ( select id from homework_commons where homework_commons.course_id = #{params[:course_id]}) GROUP BY student_works.user_id ORDER BY score desc limit #{page*10},10"
       sql_count = " select count(distinct(student_works.user_id) ) " <<
                  " from student_works left outer join users on student_works.user_id = users.id " <<