diff --git a/lib/tasks/excellent_course_exercise.rake b/lib/tasks/excellent_course_exercise.rake
index 0d8875806..a7fac1a8f 100644
--- a/lib/tasks/excellent_course_exercise.rake
+++ b/lib/tasks/excellent_course_exercise.rake
@@ -14,16 +14,18 @@ namespace :excellent_course_exercise do
     course = Course.find_by(id: course_id)
 
     course.exercises.each_with_index do |exercise, index|
-      # 第一个试卷的参与人数和通过人数都是传的数据，后续的随机
-      if index == 0
-        members = course.students.order("id asc").limit(participant_count)
-        update_exercise_user(exercise, members, pass_count)
-      else
-        new_participant_count = rand((participant_count - 423)..participant_count)
-        new_pass_count = rand((new_participant_count - 113)..new_participant_count)
+      if exercise.exercise_users.where(commit_status: 1).count == 0
+        # 第一个试卷的参与人数和通过人数都是传的数据，后续的随机
+        if index == 0
+          members = course.students.order("id asc").limit(participant_count)
+          update_exercise_user(exercise, members, pass_count)
+        else
+          new_participant_count = rand((participant_count - 423)..participant_count)
+          new_pass_count = rand((new_participant_count - 113)..new_participant_count)
 
-        members = course.students.order("id asc").limit(new_participant_count)
-        update_exercise_user(exercise, members, new_pass_count)
+          members = course.students.order("id asc").limit(new_participant_count)
+          update_exercise_user(exercise, members, new_pass_count)
+        end
       end
     end
   end
diff --git a/lib/tasks/public_course.rake b/lib/tasks/public_course.rake
index ff50a4e28..5e56926b3 100644
--- a/lib/tasks/public_course.rake
+++ b/lib/tasks/public_course.rake
@@ -110,6 +110,23 @@ namespace :public_course do
 
   end
 
+  task :create_homework_work => :environment do
+    course = Course.find(course_id)
+    course.practice_homeworks.each do |homework|
+      if homework.student_works.count == 0
+        str = ""
+        CourseMember.students(course).each do |student|
+          str += "," if str != ""
+          str += "(#{homework.id},#{student.user_id}, '#{Time.now.strftime('%Y-%m-%d %H:%M:%S')}', '#{Time.now.strftime('%Y-%m-%d %H:%M:%S')}')"
+        end
+        if str != ""
+          sql = "insert into student_works (homework_common_id, user_id, created_at, updated_at) values" + str
+          ActiveRecord::Base.connection.execute sql
+        end
+      end
+    end
+  end
+
   def min_swith(time)
     puts time
     return time < 9 ? "0#{time}" : time