diff --git a/app/controllers/bids_controller.rb b/app/controllers/bids_controller.rb
index be27a71ea..047f7103e 100644
--- a/app/controllers/bids_controller.rb
+++ b/app/controllers/bids_controller.rb
@@ -488,6 +488,11 @@ class BidsController < ApplicationController
 
       if @bid.homework_type
         @homework = HomeworkAttach.new
+        if @bid.proportion
+          teacher_proportion = @bid.proportion * 1.0 / 100
+        else
+          teacher_proportion = 1.0
+        end
         #@homework_list = @bid.homeworks
         #增加作业按评分排序，
         #@homework_list = @bid.homeworks.eager_load(:rate_averages, :user, :attachments).order('seems_rateable_cached_ratings.avg DESC').order("#{HomeworkAttach.table_name}.created_at ASC")
@@ -495,7 +500,7 @@ class BidsController < ApplicationController
             (SELECT AVG(stars) FROM seems_rateable_rates WHERE rateable_type = 'HomeworkAttach' AND rateable_id = homework_attaches.id AND rater_id = #{@bid.author_id}) AS t_score,
             (SELECT AVG(stars) FROM seems_rateable_rates WHERE rateable_type = 'HomeworkAttach' AND rateable_id = homework_attaches.id AND rater_id <> #{@bid.author_id}) AS s_score
             FROM homework_attaches WHERE bid_id = #{@bid.id} ORDER BY
-            (CASE WHEN t_score IS NULL THEN 0 ELSE t_score * #{@bid.proportion * 1.0 / 100} END + CASE WHEN s_score IS NULL THEN 0 ELSE s_score * #{1 - @bid.proportion * 1.0 / 100} END) DESC,created_at ASC")
+            (CASE WHEN t_score IS NULL THEN 0 ELSE t_score * #{teacher_proportion} END + CASE WHEN s_score IS NULL THEN 0 ELSE s_score * #{1 - teacher_proportion} END) DESC,created_at ASC")
         if params[:student_id].present?
           @temp = []
           @homework_list.each do |pro|