diff --git a/lib/tasks/public_message.rake b/lib/tasks/public_message.rake
new file mode 100644
index 000000000..a675d98fe
--- /dev/null
+++ b/lib/tasks/public_message.rake
@@ -0,0 +1,41 @@
+# bundle exec rake sync:public_message args=149,2903
+namespace :sync do
+  task :public_message => :environment do
+    subject_id = ENV['args'].split(",")[0] # 对应课程的id
+    board_id = ENV['args'].split(",")[1]
+    message_id = ENV['args'].split(",")[2]
+    status = ENV['args'].split(",")[3] # 表示相应的期数
+
+    if status.to_i == 1
+      start_time = '2018-12-16'
+      end_time = '2019-04-01'
+    elsif status.to_i == 2
+      start_time = '2019-04-07'
+      end_time = '2019-07-28'
+    else
+      # 这种情况是取所有的
+      start_time = '2015-01-01'
+      end_time = '2022-07-28'
+    end
+
+    shixun_ids = Shixun.find_by_sql("select shixun_id from stage_shixuns where stage_id in (select id from stages where
+                                     subject_id=#{subject_id}) ").map(&:shixun_id)
+
+
+    discusses = Discuss.where(dis_id: shixun_ids).where("created_at >? and created_at <?", start_time, end_time)
+    board = Board.find(board_id)
+    message = Message.find(message_id)
+    if discusses.present?
+      discusses.find_each do |discuss|
+        puts discuss.user_id
+        puts discuss.content
+        Message.create!(board: board, root_id: message.root_id || message.id,
+                        author: discuss.user_id, parent: message,
+                        message_detail_attributes: {
+                            content: discuss.try(:content)
+                        })
+      end
+    end
+
+  end
+end
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