diff --git a/app/controllers/bids_controller.rb b/app/controllers/bids_controller.rb
index 8da054d71..5fd42a97e 100644
--- a/app/controllers/bids_controller.rb
+++ b/app/controllers/bids_controller.rb
@@ -806,6 +806,7 @@ class BidsController < ApplicationController
     @bid.description = params[:bid][:description]
     @bid.is_evaluation = params[:bid][:is_evaluation]
     @bid.proportion = params[:bid][:proportion]
+    @bid.evaluation_num = params[:bid][:evaluation_num]
     @bid.reward_type = 3
     # @bid.budget = params[:bid][:budget]
     @bid.deadline = params[:bid][:deadline]
@@ -861,6 +862,7 @@ class BidsController < ApplicationController
     @bid.description = params[:bid][:description]
     @bid.is_evaluation = params[:bid][:is_evaluation]
     @bid.proportion = params[:bid][:proportion]
+    @bid.evaluation_num = params[:bid][:evaluation_num]
     @bid.reward_type = 3
     @bid.deadline = params[:bid][:deadline]
     @bid.budget = 0
@@ -1009,7 +1011,7 @@ class BidsController < ApplicationController
       if(homeworks && homeworks.size >= 2)
         homeworks.each_with_index do |homework, index|
           user = homework.user
-          n = 3 # TODO: this value should get from params, (老师设置)
+          n = @bid.evaluation_num
           n = n < homeworks.size ? n : homeworks.size - 1
           assigned_homeworks = get_assigned_homeworks(homeworks, n, index)
           assigned_homeworks.each do |h|
diff --git a/app/views/bids/_homework_form.html.erb b/app/views/bids/_homework_form.html.erb
index de4c16960..448e4144a 100644
--- a/app/views/bids/_homework_form.html.erb
+++ b/app/views/bids/_homework_form.html.erb
@@ -32,7 +32,7 @@
   <%= f.text_area :description, :rows => 8, :class => 'wiki-edit', :style => "font-size:small;width:490px;", :maxlength => Bid::DESCRIPTION_LENGTH_LIMIT %>
 </p>
 <p>
-  <%= f.text_field(:deadline, :required => true, :size => 60, :style => "width:150px;", :readonly => true, :onchange => "regexDeadLine();") %>
+  <%= f.text_field(:deadline, :required => true, :size => 60, :style => "width:100px;", :readonly => true, :onchange => "regexDeadLine();") %>
   <%= calendar_for('bid_deadline')%>
   <span id="bid_deadline_span">
   </span>
@@ -43,6 +43,10 @@
 <p>
   <%= f.select :proportion, proportion_option %>
 </p>
+<p>
+  <%= f.text_field :evaluation_num, :required => true, :size => 60, :style => "width:150px;", :onblur => "regexEvaluationNum();" , :maxlength => 4%>
+  <span id="bid_evaluation_num_span">匿评分配数量不宜太大，否则会影响开启匿评速度</span>
+</p>
 <p>
   <%= hidden_field_tag 'course_id', @course.id %>
 </p>
diff --git a/app/views/bids/edit.html.erb b/app/views/bids/edit.html.erb
index fd21872b0..3408e99b1 100644
--- a/app/views/bids/edit.html.erb
+++ b/app/views/bids/edit.html.erb
@@ -1,7 +1,7 @@
 <script type="text/javascript">
     function regexName()
     {
-        var name = $("#bid_name").val();
+        var name = $.trim($("#bid_name").val());
 
         if(name=="")
         {
@@ -18,7 +18,7 @@
     }
     function regexDeadLine()
     {
-        var deadline = $("#bid_deadline").val();
+        var deadline = $.trim($("#bid_deadline").val());
         var regex = /^\d{4}-\d{2}-\d{2}$/;
         if(deadline=="")
         {
@@ -39,10 +39,33 @@
             return false;
         }
     }
+    function regexEvaluationNum()
+    {
+        var evaluation_num = $.trim($("#bid_evaluation_num").val());
+        var regex = /^\d+$/;
+        if(evaluation_num=="")
+        {
+            $("#bid_evaluation_num_span").text("匿评分配数量不能为空");
+            $("#bid_evaluation_num_span").css('color','#ff0000');
+            return false;
+        }
+        else if(regex.test(evaluation_num))
+        {
+            $("#bid_evaluation_num_span").text("填写正确");
+            $("#bid_evaluation_num_span").css('color','#008000');
+            return true;
+        }
+        else
+        {
+            $("#bid_evaluation_num_span").text("匿评分配数量只能为数字");
+            $("#bid_evaluation_num_span").css('color','#ff0000');
+            return false;
+        }
+    }
 
     function submitHomework(id)
     {
-        if(regexDeadLine()&&regexName())
+        if(regexDeadLine()&&regexName()&&regexEvaluationNum())
         {
             $("#edit_bid_" + id).submit();
         }
diff --git a/app/views/courses/_homework_form.html.erb b/app/views/courses/_homework_form.html.erb
index 9b2010b69..9d5ad1155 100644
--- a/app/views/courses/_homework_form.html.erb
+++ b/app/views/courses/_homework_form.html.erb
@@ -37,7 +37,7 @@
 </p>
 <% time = (Time.now  + 3600 * 24).strftime('%Y-%m-%d') %>
 <p>
-  <%= f.text_field(:deadline, :required => true, :size => 60, :style => "width:150px;",:value => "#{time}", :onchange => "regexDeadLine();", :readonly => true) %>
+  <%= f.text_field(:deadline, :required => true, :size => 60, :style => "width:100px;",:value => "#{time}", :onchange => "regexDeadLine();", :readonly => true) %>
   <%= calendar_for('bid_deadline')%>
   <span id="bid_deadline_span">
   </span>
@@ -48,6 +48,10 @@
 <p>
   <%= f.select :proportion, proportion_option %>
 </p>
+<p>
+  <%= f.text_field :evaluation_num, :required => true, :size => 60, :style => "width:150px;", :onblur => "regexEvaluationNum();" , :maxlength => 4%>
+  <span id="bid_evaluation_num_span">匿评分配数量不宜太大，否则会影响开启匿评速度</span>
+</p>
 <p>
   <%= hidden_field_tag 'course_id', @course.id %>
 </p>
diff --git a/app/views/courses/new_homework.html.erb b/app/views/courses/new_homework.html.erb
index e339db2d7..5d07c54b6 100644
--- a/app/views/courses/new_homework.html.erb
+++ b/app/views/courses/new_homework.html.erb
@@ -1,7 +1,7 @@
 <script type="text/javascript">
     function regexName()
     {
-        var name = $("#bid_name").val();
+        var name = $.trim($("#bid_name").val());
 
         if(name=="")
         {
@@ -18,7 +18,7 @@
     }
     function regexDeadLine()
     {
-        var deadline = $("#bid_deadline").val();
+        var deadline = $.trim($("#bid_deadline").val());
         var regex = /^\d{4}-\d{2}-\d{2}$/;
         if(deadline=="")
         {
@@ -39,10 +39,33 @@
             return false;
         }
     }
+    function regexEvaluationNum()
+    {
+        var evaluation_num = $.trim($("#bid_evaluation_num").val());
+        var regex = /^\d+$/;
+        if(evaluation_num=="")
+        {
+            $("#bid_evaluation_num_span").text("匿评分配数量不能为空");
+            $("#bid_evaluation_num_span").css('color','#ff0000');
+            return false;
+        }
+        else if(regex.test(evaluation_num))
+        {
+            $("#bid_evaluation_num_span").text("填写正确");
+            $("#bid_evaluation_num_span").css('color','#008000');
+            return true;
+        }
+        else
+        {
+            $("#bid_evaluation_num_span").text("匿评分配数量只能为数字");
+            $("#bid_evaluation_num_span").css('color','#ff0000');
+            return false;
+        }
+    }
 
     function submitHomework()
     {
-        if(regexDeadLine()&&regexName())
+        if(regexDeadLine()&&regexName()&&regexEvaluationNum())
         {
             $("#new_bid").submit();
         }
diff --git a/config/locales/zh.yml b/config/locales/zh.yml
index 1053e0be1..9eccc498a 100644
--- a/config/locales/zh.yml
+++ b/config/locales/zh.yml
@@ -2183,4 +2183,5 @@ zh:
   label_teacher_comments: 教师评论
   label_anonymous_comments: 匿评
   label_anonymous: 匿名
-  label_submit_comments: 提交评论
\ No newline at end of file
+  label_submit_comments: 提交评论
+  field_evaluation_num: 匿评分配数量
\ No newline at end of file
diff --git a/db/migrate/20141105012624_add_evaluation_num_to_bid.rb b/db/migrate/20141105012624_add_evaluation_num_to_bid.rb
new file mode 100644
index 000000000..3578a7032
--- /dev/null
+++ b/db/migrate/20141105012624_add_evaluation_num_to_bid.rb
@@ -0,0 +1,5 @@
+class AddEvaluationNumToBid < ActiveRecord::Migration
+  def change
+    add_column :bids, :evaluation_num, :integer, default: 3
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index aceb82069..324675efb 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -11,7 +11,7 @@
 #
 # It's strongly recommended to check this file into your version control system.
 
-ActiveRecord::Schema.define(:version => 20141102054414) do
+ActiveRecord::Schema.define(:version => 20141105012624) do
 
   create_table "activities", :force => true do |t|
     t.integer "act_id",   :null => false
@@ -109,6 +109,7 @@ ActiveRecord::Schema.define(:version => 20141102054414) do
     t.integer  "is_evaluation"
     t.integer  "proportion",     :default => 60
     t.integer  "comment_status", :default => 0
+    t.integer  "evaluation_num", :default => 3
   end
 
   create_table "boards", :force => true do |t|
@@ -178,13 +179,6 @@ ActiveRecord::Schema.define(:version => 20141102054414) do
 
   add_index "changesets_issues", ["changeset_id", "issue_id"], :name => "changesets_issues_ids", :unique => true
 
-  create_table "class_members", :force => true do |t|
-    t.integer  "member_id"
-    t.integer  "course_class_id"
-    t.datetime "created_at",      :null => false
-    t.datetime "updated_at",      :null => false
-  end
-
   create_table "code_review_assignments", :force => true do |t|
     t.integer "issue_id"
     t.integer "change_id"
@@ -317,14 +311,6 @@ ActiveRecord::Schema.define(:version => 20141102054414) do
     t.integer  "container_id",   :default => 0
   end
 
-  create_table "course_classes", :force => true do |t|
-    t.string   "name"
-    t.text     "explain"
-    t.integer  "course_id"
-    t.datetime "created_at", :null => false
-    t.datetime "updated_at", :null => false
-  end
-
   create_table "course_infos", :force => true do |t|
     t.integer  "course_id"
     t.integer  "user_id"