diff --git a/app/controllers/courses_controller.rb b/app/controllers/courses_controller.rb
index e89f621c8..518cc01c4 100644
--- a/app/controllers/courses_controller.rb
+++ b/app/controllers/courses_controller.rb
@@ -836,7 +836,7 @@ class CoursesController < ApplicationController
     sql_select = ""
     if groupid == 0
       sql_select = "SELECT members.*,(
-          SELECT SUM(student_works.final_score)
+          SELECT AVG(student_works.final_score)
           FROM student_works,homework_commons
           WHERE student_works.homework_common_id = homework_commons.id
           AND homework_commons.course_id = #{@course.id}
@@ -848,7 +848,7 @@ class CoursesController < ApplicationController
         WHERE members.course_id = #{@course.id} ORDER BY score #{score_sort_by}"
     else
       sql_select = "SELECT members.*,(
-          SELECT SUM(student_works.final_score)
+          SELECT AVG(student_works.final_score)
           FROM student_works,homework_commons
           WHERE student_works.homework_common_id = homework_commons.id
           AND homework_commons.course_id = #{@course.id}
diff --git a/app/models/member.rb b/app/models/member.rb
index 2936392ab..7bde36287 100644
--- a/app/models/member.rb
+++ b/app/models/member.rb
@@ -116,21 +116,23 @@ class Member < ActiveRecord::Base
 
   # 查找每个学生每个作业的评分
   def student_homework_score
-    score_count = 0
     homework_score = StudentWork.find_by_sql("SELECT homework_commons.name,student_works.final_score as score
       FROM student_works,homework_commons
       WHERE student_works.homework_common_id = homework_commons.id
       AND homework_commons.course_id = #{self.course_id}
       AND student_works.user_id = #{self.user_id}")
-    homework_score.each do |homework|
-      mem_score = 0
-      if homework[:score]
-        mem_score = homework[:score]
-      end
-      score_count = score_count + mem_score
-    end
+    score_count = StudentWork.joins(:homework_common).where("student_works.user_id = #{self.user_id} and homework_commons.course_id = #{self.course_id}").average(:final_score).try(:round, 2).to_f
     [homework_score, format("%0.2f", score_count)]
   end
+
+  def student_work_score
+    StudentWork.joins(:homework_common).where("student_works.user_id = #{self.user_id} and homework_commons.course_id = #{self.course_id}")
+  end
+
+  def student_work_score_avg
+    StudentWork.joins(:homework_common).where("student_works.user_id = #{self.user_id} and homework_commons.course_id = #{self.course_id}").average(:final_score).try(:round, 2).to_f
+  end
+
   protected
 
   def validate_role
diff --git a/app/views/courses/_show_member_score.html.erb b/app/views/courses/_show_member_score.html.erb
index 0d250cf14..0fd1248c6 100644
--- a/app/views/courses/_show_member_score.html.erb
+++ b/app/views/courses/_show_member_score.html.erb
@@ -17,17 +17,17 @@
     <h2><%= @member_score.user.name %> 历次作业积分</h2>
     <ul class="tscore_box">
       <li ><span class="c_blue02 w280">作业名称</span><span class="c_blue02 w70">得分</span></li>
-      <% @member_score.student_homework_score[0].each do |homework_score| %>
+      <% @member_score.student_work_score.each do |homework_score| %>
             <li>
               <span class="c_grey02 w280">
                 <%= homework_score.name %>
               </span>
               <span class="c_red w70">
-                <%= format("%0.2f",homework_score[:score].nil? ? 0 : homework_score[:score]) %>
+                <%= format("%0.2f",homework_score.final_score.nil? ? 0 : homework_score.final_score) %>
               </span>
             </li>
        <% end %>
-      <li><span class="c_blue03 w280">作业积分（总得分）</span><span class="c_red w70"><%= @member_score.student_homework_score[1] %></span></li>
+      <li><span class="c_blue03 w280">作业积分（平均分）</span><span class="c_red w70"><%= @member_score.student_work_score_avg %></span></li>
     </ul>
 
   </div>