diff --git a/app/controllers/bids_controller.rb b/app/controllers/bids_controller.rb
index b06010ecb..ec2fb7d77 100644
--- a/app/controllers/bids_controller.rb
+++ b/app/controllers/bids_controller.rb
@@ -494,7 +494,7 @@ class BidsController < ApplicationController
         @is_teacher = is_course_teacher(User.current,@bid.courses.first)
         if @is_teacher
           all_homework_list = HomeworkAttach.find_by_sql("SELECT * FROM (SELECT homework_attaches.*,
-              (SELECT AVG(stars) FROM seems_rateable_rates WHERE rateable_type = 'HomeworkAttach' AND rateable_id = homework_attaches.id AND is_teacher_score = 1) AS t_score,
+              (SELECT stars FROM seems_rateable_rates WHERE rateable_type = 'HomeworkAttach' AND rateable_id = homework_attaches.id AND is_teacher_score = 1 AND stars IS NOT NULL ORDER BY updated_at DESC limit 0,1) AS t_score,
               (SELECT AVG(stars) FROM seems_rateable_rates WHERE rateable_type = 'HomeworkAttach' AND rateable_id = homework_attaches.id AND is_teacher_score = 0) AS s_score
               FROM homework_attaches WHERE bid_id = #{@bid.id} ORDER BY s_score DESC,created_at ASC) AS table1
               WHERE table1.t_score IS NULL")
@@ -502,7 +502,7 @@ class BidsController < ApplicationController
           @cur_type = 1
         else
           all_homework_list = HomeworkAttach.find_by_sql("SELECT homework_attaches.*,
-              (SELECT AVG(stars) FROM seems_rateable_rates WHERE rateable_type = 'HomeworkAttach' AND rateable_id = homework_attaches.id AND is_teacher_score = 1) AS t_score,
+              (SELECT stars FROM seems_rateable_rates WHERE rateable_type = 'HomeworkAttach' AND rateable_id = homework_attaches.id AND is_teacher_score = 1 AND stars IS NOT NULL ORDER BY updated_at DESC limit 0,1) AS t_score,
               (SELECT AVG(stars) FROM seems_rateable_rates WHERE rateable_type = 'HomeworkAttach' AND rateable_id = homework_attaches.id AND is_teacher_score = 0) AS s_score,
               (SELECT stars FROM seems_rateable_rates WHERE rateable_type = 'HomeworkAttach' AND rateable_id = homework_attaches.id AND rater_id = #{User.current.id} AND is_teacher_score = #{@is_teacher ? 1 : 0}) AS m_score
               FROM homework_attaches
diff --git a/app/controllers/homework_attach_controller.rb b/app/controllers/homework_attach_controller.rb
index e6b50e695..f4ce2e2af 100644
--- a/app/controllers/homework_attach_controller.rb
+++ b/app/controllers/homework_attach_controller.rb
@@ -48,7 +48,7 @@ class HomeworkAttachController < ApplicationController
       order_by = "created_at #{direction}"
     end
     all_homework_list = HomeworkAttach.eager_load(:attachments,:user,:rate_averages).find_by_sql("SELECT * FROM (SELECT homework_attaches.*,
-            (SELECT AVG(stars) FROM seems_rateable_rates WHERE rateable_type = 'HomeworkAttach' AND rateable_id = homework_attaches.id AND is_teacher_score = 1 and stars IS NOT NULL) AS t_score,
+            (SELECT stars FROM seems_rateable_rates WHERE rateable_type = 'HomeworkAttach' AND rateable_id = homework_attaches.id AND is_teacher_score = 1 AND stars IS NOT NULL ORDER BY updated_at DESC limit 0,1) AS t_score,
             (SELECT AVG(stars) FROM seems_rateable_rates WHERE rateable_type = 'HomeworkAttach' AND rateable_id = homework_attaches.id AND is_teacher_score = 0) AS s_score
             FROM homework_attaches WHERE bid_id = #{@bid.id}
             ORDER BY #{order_by}) AS table1
@@ -80,7 +80,7 @@ class HomeworkAttachController < ApplicationController
       order_by = "created_at #{direction}"
     end
     all_homework_list = HomeworkAttach.eager_load(:attachments,:user,:rate_averages).find_by_sql("SELECT homework_attaches.*,
-            (SELECT AVG(stars) FROM seems_rateable_rates WHERE rateable_type = 'HomeworkAttach' AND rateable_id = homework_attaches.id AND is_teacher_score = 1) AS t_score,
+            (SELECT stars FROM seems_rateable_rates WHERE rateable_type = 'HomeworkAttach' AND rateable_id = homework_attaches.id AND is_teacher_score = 1 AND stars IS NOT NULL ORDER BY updated_at DESC limit 0,1) AS t_score,
             (SELECT AVG(stars) FROM seems_rateable_rates WHERE rateable_type = 'HomeworkAttach' AND rateable_id = homework_attaches.id AND is_teacher_score = 0) AS s_score
             FROM homework_attaches WHERE bid_id = #{@bid.id}
             ORDER BY #{order_by}")
@@ -101,7 +101,7 @@ class HomeworkAttachController < ApplicationController
   def get_student_batch_homework
     @is_student_batch_homework = true
     all_homework_list = HomeworkAttach.eager_load(:attachments,:user,:rate_averages).find_by_sql("SELECT homework_attaches.*,
-          (SELECT AVG(stars) FROM seems_rateable_rates WHERE rateable_type = 'HomeworkAttach' AND rateable_id = homework_attaches.id AND is_teacher_score = 1) AS t_score,
+          (SELECT stars FROM seems_rateable_rates WHERE rateable_type = 'HomeworkAttach' AND rateable_id = homework_attaches.id AND is_teacher_score = 1 AND stars IS NOT NULL ORDER BY updated_at DESC limit 0,1) AS t_score,
           (SELECT AVG(stars) FROM seems_rateable_rates WHERE rateable_type = 'HomeworkAttach' AND rateable_id = homework_attaches.id AND is_teacher_score = 0) AS s_score,
           (SELECT stars FROM seems_rateable_rates WHERE rateable_type = 'HomeworkAttach' AND rateable_id = homework_attaches.id AND rater_id = #{User.current.id}  AND is_teacher_score = 0) AS m_score
           FROM homework_attaches
@@ -119,14 +119,14 @@ class HomeworkAttachController < ApplicationController
   def get_my_homework
     @is_my_homework = true
     all_homework_list = HomeworkAttach.find_by_sql("SELECT homework_attaches.*,
-        (SELECT AVG(stars) FROM seems_rateable_rates WHERE rateable_type = 'HomeworkAttach' AND rateable_id = homework_attaches.id AND is_teacher_score = 1) AS t_score,
+        (SELECT stars FROM seems_rateable_rates WHERE rateable_type = 'HomeworkAttach' AND rateable_id = homework_attaches.id AND is_teacher_score = 1 AND stars IS NOT NULL ORDER BY updated_at DESC limit 0,1) AS t_score,
         (SELECT AVG(stars) FROM seems_rateable_rates WHERE rateable_type = 'HomeworkAttach' AND rateable_id = homework_attaches.id AND is_teacher_score = 0) AS s_score
         FROM homework_attaches
         WHERE homework_attaches.bid_id = #{@bid.id} AND homework_attaches.user_id = #{User.current.id}")
     #如果我没有创建过作业，就检索我是否参与了某个作业
     if all_homework_list.empty?
       all_homework_list = HomeworkAttach.find_by_sql("SELECT homework_attaches.*,
-        (SELECT AVG(stars) FROM seems_rateable_rates WHERE rateable_type = 'HomeworkAttach' AND rateable_id = homework_attaches.id AND is_teacher_score = 1) AS t_score,
+        (SELECT stars FROM seems_rateable_rates WHERE rateable_type = 'HomeworkAttach' AND rateable_id = homework_attaches.id AND is_teacher_score = 1 AND stars IS NOT NULL ORDER BY updated_at DESC limit 0,1) AS t_score,
         (SELECT AVG(stars) FROM seems_rateable_rates WHERE rateable_type = 'HomeworkAttach' AND rateable_id = homework_attaches.id AND is_teacher_score = 0) AS s_score
         FROM homework_attaches
         INNER JOIN homework_users ON homework_users.homework_attach_id = homework_attaches.id
@@ -439,8 +439,8 @@ class HomeworkAttachController < ApplicationController
     homework = @homework
     is_teacher = @is_teacher ? 1 : 0
     #保存评分@homework.rate(@m_score.to_i,User.current.id,:quality, (@is_teacher ? 1 : 0))
-    if @m_score
-      rate = @homework.rates(:quality).where(:rater_id => User.current.id, :is_teacher_score => is_teacher).first
+    rate = @homework.rates(:quality).where(:rater_id => User.current.id, :is_teacher_score => is_teacher).first
+    if @m_score && rate.stars != @m_score
       if rate
         rate.stars = @m_score
         rate.save!
@@ -480,18 +480,18 @@ class HomeworkAttachController < ApplicationController
       get_not_batch_homework_list "s_socre","desc",@homework.bid_id
     elsif @cur_type == "2" #老师已批列表
       @result_homework = HomeworkAttach.find_by_sql("SELECT homework_attaches.*,
-            (SELECT AVG(stars) FROM seems_rateable_rates WHERE rateable_type = 'HomeworkAttach' AND rateable_id = homework_attaches.id AND is_teacher_score = 1 and stars IS NOT NULL) AS t_score,
+            (SELECT stars FROM seems_rateable_rates WHERE rateable_type = 'HomeworkAttach' AND rateable_id = homework_attaches.id AND is_teacher_score = 1 AND stars IS NOT NULL ORDER BY updated_at DESC limit 0,1) AS t_score,
             (SELECT AVG(stars) FROM seems_rateable_rates WHERE rateable_type = 'HomeworkAttach' AND rateable_id = homework_attaches.id AND is_teacher_score = 0) AS s_score
             FROM homework_attaches WHERE id = #{@homework.id}").first
     elsif @cur_type == "3" #全部作业列表
       @result_homework = HomeworkAttach.find_by_sql("SELECT homework_attaches.*,
-            (SELECT AVG(stars) FROM seems_rateable_rates WHERE rateable_type = 'HomeworkAttach' AND rateable_id = homework_attaches.id AND is_teacher_score = 1) AS t_score,
+            (SELECT stars FROM seems_rateable_rates WHERE rateable_type = 'HomeworkAttach' AND rateable_id = homework_attaches.id AND is_teacher_score = 1 AND stars IS NOT NULL ORDER BY updated_at DESC limit 0,1) AS t_score,
             (SELECT AVG(stars) FROM seems_rateable_rates WHERE rateable_type = 'HomeworkAttach' AND rateable_id = homework_attaches.id AND is_teacher_score = 0) AS s_score
             FROM homework_attaches WHERE id = #{@homework.id}").first
     elsif @cur_type == "4" #匿评作业列表
       @is_student_batch_homework = true
       @result_homework = HomeworkAttach.find_by_sql("SELECT homework_attaches.*,
-          (SELECT AVG(stars) FROM seems_rateable_rates WHERE rateable_type = 'HomeworkAttach' AND rateable_id = homework_attaches.id AND is_teacher_score = 1) AS t_score,
+          (SELECT stars FROM seems_rateable_rates WHERE rateable_type = 'HomeworkAttach' AND rateable_id = homework_attaches.id AND is_teacher_score = 1 AND stars IS NOT NULL ORDER BY updated_at DESC limit 0,1) AS t_score,
           (SELECT AVG(stars) FROM seems_rateable_rates WHERE rateable_type = 'HomeworkAttach' AND rateable_id = homework_attaches.id AND is_teacher_score = 0) AS s_score,
           (SELECT stars FROM seems_rateable_rates WHERE rateable_type = 'HomeworkAttach' AND rateable_id = homework_attaches.id AND rater_id = #{User.current.id}  AND is_teacher_score = #{is_teacher}) AS m_score
           FROM homework_attaches
@@ -595,7 +595,7 @@ class HomeworkAttachController < ApplicationController
       order_by = "created_at #{direction}"
     end
     @all_homework_list = HomeworkAttach.eager_load(:attachments,:user,:rate_averages).find_by_sql("SELECT * FROM (SELECT homework_attaches.*,
-        (SELECT AVG(stars) FROM seems_rateable_rates WHERE rateable_type = 'HomeworkAttach' AND rateable_id = homework_attaches.id AND is_teacher_score = 1) AS t_score,
+        (SELECT stars FROM seems_rateable_rates WHERE rateable_type = 'HomeworkAttach' AND rateable_id = homework_attaches.id AND is_teacher_score = 1 AND stars IS NOT NULL ORDER BY updated_at DESC limit 0,1) AS t_score,
         (SELECT AVG(stars) FROM seems_rateable_rates WHERE rateable_type = 'HomeworkAttach' AND rateable_id = homework_attaches.id AND is_teacher_score = 0) AS s_score
         FROM homework_attaches WHERE bid_id = #{bid_id}
         ORDER BY #{order_by}) AS table1