diff --git a/app/models/memo.rb b/app/models/memo.rb
index 2831effe3..e0abaa19f 100644
--- a/app/models/memo.rb
+++ b/app/models/memo.rb
@@ -9,7 +9,7 @@ class Memo < ActiveRecord::Base
 	# 若是主题帖，则内容可以是空
 	#validates :content, presence: true, if: Proc.new{|o| !o.parent_id.nil? }
 	validates_length_of :subject, maximum: 50
-	#validates_length_of :content, maximum: 3072
+	validates_length_of :content, maximum: 5000
 	validate :cannot_reply_to_locked_topic, :on => :create
 
 	acts_as_tree :counter_cache => :replies_count, :order => "#{Memo.table_name}.created_at ASC"