diff --git a/app/models/challenge_answer.rb b/app/models/challenge_answer.rb
index 32e74542d..8196a7b7e 100644
--- a/app/models/challenge_answer.rb
+++ b/app/models/challenge_answer.rb
@@ -3,7 +3,7 @@ class ChallengeAnswer < ApplicationRecord
   belongs_to :challenge
   has_many :game_answers, :dependent => :destroy
 
-  validates :contents, length: { maximum: 5000 , too_long: "不能超过25000个字符"}
+  validates :contents, length: { maximum: 25000 , too_long: "不能超过25000个字符"}
 
   def view_answer_time(user_id)
     game_answers.where(user_id: user_id).last&.view_time