diff --git a/app/controllers/student_work_controller.rb b/app/controllers/student_work_controller.rb
index 17c98e3b1..593d6bf53 100644
--- a/app/controllers/student_work_controller.rb
+++ b/app/controllers/student_work_controller.rb
@@ -42,9 +42,6 @@ class StudentWorkController < ApplicationController
 
         end
       end
-
-   
-
     
     render :json => resultObj
   end
@@ -165,24 +162,23 @@ class StudentWorkController < ApplicationController
 
   def create
     if params[:student_work]
-      stundet_work = StudentWork.find(params[:student_work_id]) if params[:student_work_id]
-      stundet_work ||= StudentWork.new
-      stundet_work.name = params[:student_work][:name]
-      stundet_work.description = params[:student_work][:description]
-      stundet_work.project_id = params[:student_work][:project_id]
-      stundet_work.homework_common_id = @homework.id
-      stundet_work.user_id = User.current.id
-      stundet_work.save_attachments(params[:attachments])
+      student_work = StudentWork.find(params[:student_work_id]) if params[:student_work_id]
+      student_work ||= StudentWork.new
+      student_work.name = params[:student_work][:name]
+      student_work.description = params[:student_work][:description]
+      student_work.project_id = params[:student_work][:project_id]
+      student_work.homework_common_id = @homework.id
+      student_work.user_id = User.current.id
+      student_work.save_attachments(params[:attachments])
       if Time.parse(@homework.end_time.to_s).strftime("%Y-%m-%d") < Time.parse(Time.now.to_s).strftime("%Y-%m-%d")
-        stundet_work.late_penalty = @homework.late_penalty
+        student_work.late_penalty = @homework.late_penalty
         else
-        stundet_work.late_penalty = 0
+        student_work.late_penalty = 0
       end
-      render_attachment_warning_if_needed(stundet_work)
-      if stundet_work.save
-        if @homework.homework_type == 2 && @homework.homework_detail_programing       #编程作业，学生提交作品后计算系统得分
-         
-        end
+      render_attachment_warning_if_needed(student_work)
+
+      if student_work.save
+
         respond_to do |format|
           format.html {
             flash[:notice] = l(:notice_successful_create)
@@ -624,7 +620,7 @@ class StudentWorkController < ApplicationController
   end
 
   def find_or_save_student_work(is_test)
-    student_work = @homework.student_works.where(user_id: User.current.id).first
+    student_work = StudentWork.where(homework_common_id: @homework.id, user_id: User.current.id).first
     if student_work.nil?
       @homework.student_works.build(
         name: params[:title],
@@ -633,6 +629,7 @@ class StudentWorkController < ApplicationController
         is_test: is_test
         )
       unless @homework.save
+        logger.debug @homework.errors.full_messages
       else
         student_work = @homework.student_works.where(user_id: User.current.id).first
       end
diff --git a/app/controllers/users_controller.rb b/app/controllers/users_controller.rb
index 9c6492448..8bb971dab 100644
--- a/app/controllers/users_controller.rb
+++ b/app/controllers/users_controller.rb
@@ -367,8 +367,15 @@ class UsersController < ApplicationController
   end
 
   def user_commit_homework
-    flash[:notice] = l(:notice_successful_create)
-    redirect_to student_work_index_url(:homework => params[:homework])
+    homework = HomeworkCommon.find(params[:homework])
+    student_work = homework.student_works.where(user_id: User.current.id).first
+    if student_work
+      student_work.save
+      flash[:notice] = l(:notice_successful_create)
+      redirect_to student_work_index_url(:homework => params[:homework])
+    else 
+      render_403
+    end
   end
 
   def user_new_homework
diff --git a/app/models/homework_common.rb b/app/models/homework_common.rb
index b51de6c2c..0bff38558 100644
--- a/app/models/homework_common.rb
+++ b/app/models/homework_common.rb
@@ -56,6 +56,10 @@ class HomeworkCommon < ActiveRecord::Base
     Mailer.run.homework_added(self)
   end
 
+  def is_program_homework?
+    self.homework_type == 2 && self.homework_detail_programing
+  end
+
   delegate :language_name, :to => :homework_detail_programing
 
 end
diff --git a/app/models/student_work.rb b/app/models/student_work.rb
index d7287dcc4..0a5c1b65c 100644
--- a/app/models/student_work.rb
+++ b/app/models/student_work.rb
@@ -10,10 +10,32 @@ class StudentWork < ActiveRecord::Base
   has_many :student_work_tests, order: 'id desc'
 
   before_destroy :delete_praise
+  before_save :set_program_score, :set_src
 
   acts_as_attachable
 
   def delete_praise
     PraiseTread.where("praise_tread_object_id = #{self.id} AND praise_tread_object_type = 'StudentWork'").destroy_all
   end
+
+  def last_test
+    student_work_tests.order('id desc').first
+  end
+
+  private 
+  def set_program_score
+    if homework_common.is_program_homework?       #编程作业，学生提交作品后计算系统得分
+        #根据最后一次测试计算得分
+        unless last_test
+          self.system_score = 0
+        else
+          self.system_score = last_test.test_score
+        end
+    end
+
+  end
+  def set_src
+    self.description = last_test.src if last_test
+  end
+
 end
diff --git a/app/models/student_work_test.rb b/app/models/student_work_test.rb
index 96aa1d6c3..1cfb7f8b2 100644
--- a/app/models/student_work_test.rb
+++ b/app/models/student_work_test.rb
@@ -34,10 +34,19 @@ class StudentWorkTest < ActiveRecord::Base
 
   def test_score
     if self.status.to_i == 0
-      format("%.1f",100.0 / self.student_work.homework_common.homework_tests.count)
-    else
+      100
+    elsif self.results.empty?
       0
+    else 
+      get_success_count * 100 / self.results.count
     end
   end
 
+  private
+  def get_success_count
+    self.results.inject(0) do |sum, result|
+      sum += (result["status"].to_i == 0 ? 1 : 0)
+    end || 0
+  end
+
 end