diff --git a/app/controllers/commons_controller.rb b/app/controllers/commons_controller.rb
index 1f6dce053..a23d4dba7 100644
--- a/app/controllers/commons_controller.rb
+++ b/app/controllers/commons_controller.rb
@@ -45,7 +45,13 @@ class CommonsController < ApplicationController
     code =
       case params[:object_type].strip
       when 'message'
-        if current_user.course_identity(@object.board.course) >= 5 && @object.author != current_user
+        if current_user.course_identity(@object.board.course) >= Course::STUDENT && @object.author != current_user
+          403
+        else
+          200
+        end
+      when 'journals_for_message'
+        if current_user.course_identity(@object.jour.course)  >= Course::STUDENT && @object.user != current_user
           403
         else
           200
diff --git a/app/controllers/exercises_controller.rb b/app/controllers/exercises_controller.rb
index 0b8e12094..6af48dbd1 100644
--- a/app/controllers/exercises_controller.rb
+++ b/app/controllers/exercises_controller.rb
@@ -1040,6 +1040,7 @@ class ExercisesController < ApplicationController
           @exercise_questions = @exercise_questions.order("question_number ASC")
         end
         # 判断问题是否已回答还是未回答
+        @exercise_questions = @exercise_questions.includes(:exercise_stand_answers,:exercise_answers,:exercise_shixun_answers)
 
         if @t_user_exercise_status == 3
           get_each_student_exercise(@exercise.id,@exercise_questions,@exercise_current_user_id)
@@ -1129,7 +1130,7 @@ class ExercisesController < ApplicationController
         @is_teacher_or = @user_course_identity < Course::STUDENT ? 1 : 0
         @student_status = 2
         # @exercise_answerer = User.find_by(id:@exercise_current_user_id)  #试卷回答者
-        @exercise_questions = @exercise.exercise_questions.order("question_number ASC")
+        @exercise_questions = @exercise.exercise_questions.includes(:exercise_shixun_challenges,:exercise_standard_answers,:exercise_answers,:exercise_shixun_answers).order("question_number ASC")
         @question_status = []
         get_exercise_status = @exercise.get_exercise_status(current_user)
         if @ex_user.present? && @is_teacher_or == 0
diff --git a/app/controllers/messages_controller.rb b/app/controllers/messages_controller.rb
index f684b27f3..0c61e2b69 100644
--- a/app/controllers/messages_controller.rb
+++ b/app/controllers/messages_controller.rb
@@ -87,7 +87,10 @@ class MessagesController < ApplicationController
   end
 
   def show
-    @message =  Message.includes(:attachments, :message_detail, :children, :author => :user_extension, :board => [{course: :board_course_modules}]).find_by_id params[:id]
+    @message =  Message.includes(:attachments, :message_detail,
+                                  :children, :author => :user_extension,
+                                  :board => [{course: :board_course_modules}])
+                                  .find_by_id params[:id]
     return normal_status(-2, "ID为#{params[:id]}的帖子不存在") if @message.nil?
 
     @attachment_size = @message.attachments.size
diff --git a/app/controllers/shixuns_controller.rb b/app/controllers/shixuns_controller.rb
index b8a5ec53c..c237da5e2 100644
--- a/app/controllers/shixuns_controller.rb
+++ b/app/controllers/shixuns_controller.rb
@@ -44,11 +44,12 @@ class ShixunsController < ApplicationController
 		## 搜索关键字 匹配关卡名, 用户名, 实训名 和 空格多搜索
 		if params[:keyword].present?
 			keyword = params[:keyword].strip
-			@shixuns = @shixuns.joins(:users, challenges: :challenge_tags).
-					where("challenge_tags.name like '%#{keyword}%'
-                  or challenges.subject like '%#{keyword}%'
-                  or concat(lastname, firstname) like '%#{keyword}%'
-                  or shixuns.name like '%#{keyword.split(" ").join("%")}%'").distinct
+			@shixuns = @shixuns.joins(:user, challenges: :challenge_tags).
+					where("challenge_tags.name like :keyword
+                  or challenges.subject like :keyword
+                  or concat(lastname, firstname) like :keyword
+                  or shixuns.name like :name",
+								keyword: "%#{keyword}%", name: "%#{keyword.split(" ").join("%")}%").distinct
 		end
 
 		## 筛选 状态
@@ -68,15 +69,15 @@ class ShixunsController < ApplicationController
 			when 'new'
 				@shixuns = @shixuns.order("shixuns.status = 2 desc, shixuns.created_at #{bsort}")
 			when 'hot'
-				@shixuns = @shixuns.order("shixuns.status = 2 desc, myshixuns_count #{bsort}")
+				@shixuns = @shixuns.order("shixuns.status = 2 desc, shixuns.myshixuns_count #{bsort}")
       when 'mine'
         @shixuns = @shixuns.order("shixuns.created_at #{bsort}")
       else
-				@shixuns = @shixuns.order("shixuns.status = 2 desc, publish_time #{bsort}")
+				@shixuns = @shixuns.order("shixuns.status = 2 desc, shixuns.publish_time #{bsort}")
 		end
 
-
-		@total_count = @shixuns.count
+		# 用id计数会快10+MS左右,对于搜索的内容随着数据的增加，性能会提升一些。
+		@total_count = @shixuns.count("shixuns.id")
 
 		## 分页参数
 		page  = params[:page]  || 1
diff --git a/app/helpers/exercises_helper.rb b/app/helpers/exercises_helper.rb
index 0b64cb916..314a90403 100644
--- a/app/helpers/exercises_helper.rb
+++ b/app/helpers/exercises_helper.rb
@@ -9,9 +9,29 @@ module ExercisesHelper
     @ex_obj_array = []
     exercise_obj_status.each do |q|
       if q.question_type == 5
-        ques_score = q.exercise_shixun_answers.search_shixun_answers("user_id",user_id).pluck(:score).sum
+        answers_content = q.exercise_shixun_answers.search_shixun_answers("user_id",user_id)
       else
-        ques_score = q.exercise_answers.search_answer_users("user_id",user_id).score_reviewed.pluck(:score).sum
+        answers_content = q.exercise_answers.search_answer_users("user_id",user_id)
+      end
+
+      if q.question_type <= 2
+        if answers_content.present?   #学生有回答时
+          answer_choice_array = []
+          answers_content.each do |a|
+            answer_choice_array.push(a.exercise_choice.choice_position)  #学生答案的位置
+          end
+          user_answer_content = answer_choice_array.sort
+          standard_answer = q.exercise_standard_answers.pluck(:exercise_choice_id).sort  #该问题的标准答案，可能有多个
+          if user_answer_content == standard_answer  #答案一致,多选或单选才给分，答案不对不给分
+            ques_score = q.question_score
+          else
+            ques_score = 0.0
+          end
+        else
+          ques_score = 0.0
+        end
+      else
+        ques_score = answers_content.select(:score).pluck(:score).sum
       end
 
       if ques_score >= q.question_score  #满分作答为正确
@@ -370,7 +390,8 @@ module ExercisesHelper
             standard_answer = q.exercise_standard_answers.pluck(:exercise_choice_id).sort  #该问题的标准答案，可能有多个
             if user_answer_content == standard_answer  #答案一致,多选或单选才给分，答案不对不给分
               if standard_answer.count > 0
-                q_score_1 = (q.question_score.to_f / standard_answer.count)   #当多选答案正确时，每个answer的分数均摊。
+                q_score_1 = q.question_score
+                # q_score_1 = (q.question_score.to_f / standard_answer.count)   #当多选答案正确时，每个answer的分数均摊。
               else
                 q_score_1 = 0.0
               end
@@ -641,6 +662,7 @@ module ExercisesHelper
     user_score = nil
     shixun_type = 0
     question_comment = []
+    # user_score_pre = nil
     if ques_type == 5
       exercise_answers = q.exercise_shixun_answers.search_shixun_answers("user_id",ex_answerer_id)
     else
@@ -648,10 +670,26 @@ module ExercisesHelper
     end
     if student_status == 2   #当前为老师，或为学生且已提交
       user_score_pre = exercise_answers.score_reviewed
-      if ques_type == 4 && user_score_pre.blank?  #主观题时，且没有大于0的分数时，为空
-        user_score = nil
-      else
+      if ques_type == 4  #主观题时，且没有大于0的分数时，为空
+        user_score = user_score_pre.present? ? user_score_pre.pluck(:score).sum : nil
+      elsif ques_type == 5 || ques_type == 3
         user_score = user_score_pre.present? ? user_score_pre.pluck(:score).sum : 0.0
+      else
+        if exercise_answers.present?   #判断题和选择题时，
+          answer_choice_array = []
+          exercise_answers.each do |a|
+            answer_choice_array.push(a.exercise_choice.choice_position)  #学生答案的位置
+          end
+          user_answer_content = answer_choice_array.sort
+          standard_answer = q.exercise_standard_answers.pluck(:exercise_choice_id).sort  #该问题的标准答案，可能有多个
+          if user_answer_content == standard_answer  #答案一致,多选或单选才给分，答案不对不给分
+            user_score = q.question_score
+          else
+            user_score = 0.0
+          end
+        else
+          user_score = 0.0
+        end
       end
     end
 
@@ -659,9 +697,9 @@ module ExercisesHelper
       user_score = q.question_score
     end
     if ques_type <= 2
-      answered_content = exercise_answers.pluck(:exercise_choice_id)
+      answered_content = exercise_answers&.pluck(:exercise_choice_id)
     elsif ques_type == 3
-      exercise_answers.each do |a|
+      exercise_answers&.each do |a|
         u_answer = {
             "choice_id":a.exercise_choice_id,
             "answer_text": a.answer_text
@@ -669,7 +707,7 @@ module ExercisesHelper
         answered_content.push(u_answer)
       end
     elsif ques_type == 4
-      answered_content = exercise_answers.pluck(:answer_text)
+      answered_content = exercise_answers&.pluck(:answer_text)
     end
     if ques_type == 5  #存在实训题，及已经做了实训题的
       if ex_status == 3 || is_teacher_or == 1  #如果试卷已截止，则可以看到分数，否则不能查看分数
diff --git a/app/models/message.rb b/app/models/message.rb
index 6b41cdd95..7588ddc2a 100644
--- a/app/models/message.rb
+++ b/app/models/message.rb
@@ -73,7 +73,7 @@ class Message < ApplicationRecord
 
   # 包含二级回复的总点赞数
   def total_praises_count
-    descendants.sum(:praises_count)
+    praises_count + descendants.sum(:praises_count)
   end
 
   # 包含二级回复数的总回复数
diff --git a/app/models/shixun.rb b/app/models/shixun.rb
index cb305efaf..afad10397 100644
--- a/app/models/shixun.rb
+++ b/app/models/shixun.rb
@@ -52,7 +52,7 @@ class Shixun < ApplicationRecord
     end
   }
 
-  scope :visible, -> { where("status != -1") }
+  scope :visible, -> { where.not(status: -1) }
   scope :published, lambda{ where(status: 2) }
   scope :unhidden, lambda{ where(hidden: 0, status: 2) }
   scope :field_for_recommend, lambda{ select([:id, :name, :identifier, :myshixuns_count]) }