diff --git a/app/models/message_detail.rb b/app/models/message_detail.rb
index 9f5269bc5..d589ada3e 100644
--- a/app/models/message_detail.rb
+++ b/app/models/message_detail.rb
@@ -1,5 +1,5 @@
 class MessageDetail < ApplicationRecord
   belongs_to :message, :touch => true
-  validates :content, length: { maximum: 5000, too_long: "内容不能超过5000个字符" }
+  validates :content, length: { maximum: 10000, too_long: "内容不能超过10000个字符" }
 
 end