diff --git a/app/models/message.rb b/app/models/message.rb
index f5df220a0..bb12473be 100644
--- a/app/models/message.rb
+++ b/app/models/message.rb
@@ -80,7 +80,7 @@ class Message < ActiveRecord::Base
   # after_create :add_author_as_watcher, :reset_counters!, :add_boards_count
   after_update :update_messages_board, :update_activity
   after_destroy :reset_counters!,:down_user_score,:delete_kindeditor_assets, :decrease_boards_count, :down_course_score
-  after_create :act_as_course_activity, :act_as_forge_activity, :act_as_student_score, act_as_at_message(:content, :author_id), :add_author_as_watcher, :reset_counters!, :add_boards_count
+  after_create :act_as_course_activity, :act_as_forge_activity, :act_as_system_message, :send_mail, :act_as_student_score, act_as_at_message(:content, :author_id), :add_author_as_watcher, :reset_counters!, :add_boards_count
   #before_save :be_user_score
 
   scope :visible, lambda {|*args|
@@ -257,13 +257,13 @@ class Message < ActiveRecord::Base
   def act_as_system_message
     if self.course
       if self.parent_id.nil?   # 主贴
-        self.course.members.each do |m|
+        self.course.members.includes(:user).each do |m|
           if self.author.allowed_to?(:as_teacher, self.course) &&  m.user_id != self.author_id   # 老师 自己的帖子不给自己发送消息
             self.course_messages << CourseMessage.new(:user_id => m.user_id, :course_id => self.board.course_id, :viewed => false)
           end
         end
       else    # 回帖
-        self.course.members.each do |m|
+        self.course.members.includes(:user).each do |m|
           if m.user_id ==  Message.find(self.parent_id).author_id  && m.user_id != self.author_id  # 只针对主贴回复，回复自己的帖子不发消息
             self.course_messages << CourseMessage.new(:user_id => m.user_id, :course_id => self.board.course_id, :viewed => false)
           end
@@ -271,13 +271,13 @@ class Message < ActiveRecord::Base
       end
     elsif self.project  # 项目相关
       if self.parent_id.nil?   # 主贴
-        self.project.members.each do |m|
+        self.project.members.includes(:user).each do |m|
           if  m.user_id != self.author_id
             self.forge_messages << ForgeMessage.new(:user_id => m.user_id, :project_id => self.board.project_id, :viewed => false)
           end
         end
       else    # 回帖
-        self.project.members.each do |m|
+        self.project.members.includes(:user).each do |m|
           if m.user_id ==  Message.find(self.parent_id).author_id  && m.user_id != self.author_id  # 只针对主贴回复，回复自己的帖子不发消息
             self.forge_messages << ForgeMessage.new(:user_id => m.user_id, :project_id => self.board.project_id, :viewed => false)
           end