diff --git a/app/services/courses_service.rb b/app/services/courses_service.rb
index 3fc9fb51c..e8b0b6a5e 100644
--- a/app/services/courses_service.rb
+++ b/app/services/courses_service.rb
@@ -734,10 +734,9 @@ class CoursesService
     user_list = []
     max_size = 0
     if params[:type] == 1
-      homework_count = Course.find(params[:course_id]).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 = #{params[:course_id]}) GROUP BY student_works.user_id ORDER BY score limit #{page*10},10"
+      sql = "select users.*,sum(student_works.final_score) 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 " <<
                  " where homework_common_id in " <<