diff --git a/app/models/challenge.rb b/app/models/challenge.rb
index 73079d82b..e9bef0c9d 100644
--- a/app/models/challenge.rb
+++ b/app/models/challenge.rb
@@ -28,6 +28,9 @@ class Challenge < ApplicationRecord
 
   scope :fields_for_list, -> { select([:id, :subject, :st, :score, :position, :shixun_id]) }
 
+  validates :task_pass, length: { maximum: 10000 }
+
+
   after_commit :create_diff_record
 
   def next_challenge
diff --git a/app/models/challenge_answer.rb b/app/models/challenge_answer.rb
index 0ce757d71..d3fd69cd0 100644
--- a/app/models/challenge_answer.rb
+++ b/app/models/challenge_answer.rb
@@ -3,6 +3,8 @@ class ChallengeAnswer < ApplicationRecord
   belongs_to :challenge
   has_many :game_answers, :dependent => :destroy
 
+  validates :contents, length: { maximum: 5000 }
+
   def view_answer_time(user_id)
     game_answers.where(user_id: user_id).last&.view_time
   end
diff --git a/app/models/challenge_choose.rb b/app/models/challenge_choose.rb
index 2463d3317..2b8858f21 100644
--- a/app/models/challenge_choose.rb
+++ b/app/models/challenge_choose.rb
@@ -3,4 +3,7 @@ class ChallengeChoose < ApplicationRecord
   belongs_to :challenge, optional: true
   has_many :challenge_tags, :dependent => :destroy
   has_many :challenge_questions, dependent: :destroy
+
+  validates :subject, length: { maximum: 1000 }
+
 end
diff --git a/app/models/challenge_question.rb b/app/models/challenge_question.rb
index b0927aec0..959b033f9 100644
--- a/app/models/challenge_question.rb
+++ b/app/models/challenge_question.rb
@@ -1,3 +1,6 @@
 class ChallengeQuestion < ApplicationRecord
   belongs_to :challenge_choose
+
+  validates :option_name, length: { maximum: 500 }
+
 end
diff --git a/app/models/competition.rb b/app/models/competition.rb
index 96fd14c1c..1d10e2032 100644
--- a/app/models/competition.rb
+++ b/app/models/competition.rb
@@ -33,6 +33,8 @@ class Competition < ApplicationRecord
   has_many :competition_prizes, dependent: :destroy
   has_many :competition_prize_users, dependent: :destroy
 
+  validates :introduction, length: { maximum: 500 }
+
   before_save :set_laboratory
   after_create :create_competition_modules
 
diff --git a/app/models/competition_module_md_content.rb b/app/models/competition_module_md_content.rb
index 4a8dacf9e..936ded8ef 100644
--- a/app/models/competition_module_md_content.rb
+++ b/app/models/competition_module_md_content.rb
@@ -5,4 +5,6 @@ class CompetitionModuleMdContent < ApplicationRecord
 
   # validates :name, presence: true
   validates :content, presence: true
+  validates :content, length: { maximum: 10000 }
+
 end
\ No newline at end of file
diff --git a/app/models/discuss.rb b/app/models/discuss.rb
index a236a2bbc..f35ca4751 100644
--- a/app/models/discuss.rb
+++ b/app/models/discuss.rb
@@ -13,6 +13,8 @@ class Discuss < ApplicationRecord
   belongs_to :challenge, optional: true
   validate :validate_sensitive_string
 
+  validates :content, length: { maximum: 1000 }
+
   after_create :send_tiding
 
   scope :children, -> (discuss_id){ where(parent_id: discuss_id).includes(:user).reorder(created_at: :asc) }
diff --git a/app/models/gtask_bank.rb b/app/models/gtask_bank.rb
index 55f83ef10..f9d38d33f 100644
--- a/app/models/gtask_bank.rb
+++ b/app/models/gtask_bank.rb
@@ -9,4 +9,6 @@ class GtaskBank < ApplicationRecord
   scope :myself, ->(user_id) { where(user_id: user_id)}
   scope :is_public, -> { where(:is_public => true) }
 
+  validates :name, length: { maximum: 60 }
+  validates :description, length: { maximum: 5000 }
 end
diff --git a/app/models/gtopic_bank.rb b/app/models/gtopic_bank.rb
index 609219711..fe9f184eb 100644
--- a/app/models/gtopic_bank.rb
+++ b/app/models/gtopic_bank.rb
@@ -7,4 +7,11 @@ class GtopicBank < ApplicationRecord
   has_many :graduation_topics, dependent: :nullify
 
   scope :myself, ->(user_id) { where(user_id: user_id)}
+
+
+  # 课题名称和描述字段长度限制
+  validates :name, length: { maximum: 60,
+                             too_long: "60 characters is the maximum allowed" }
+  validates :description, length: { maximum: 5000,
+                                    too_long: "5000 characters is the maximum allowed" }
 end
diff --git a/app/models/homework_bank.rb b/app/models/homework_bank.rb
index 7c9de0cda..d6db7bfab 100644
--- a/app/models/homework_bank.rb
+++ b/app/models/homework_bank.rb
@@ -10,4 +10,7 @@ class HomeworkBank < ApplicationRecord
   scope :is_public, -> { where(is_public: true)}
   scope :myself, ->(user_id) { where(user_id: user_id)}
 
+  validates :name, length: { maximum: 60 }
+  validates :description, length: { maximum: 15000 }
+  validates :reference_answer, length: { maximum: 15000 }
 end
diff --git a/app/models/library.rb b/app/models/library.rb
index 743959d30..982db732b 100644
--- a/app/models/library.rb
+++ b/app/models/library.rb
@@ -13,6 +13,7 @@ class Library < ApplicationRecord
   has_one :praise_tread_cache, foreign_key: :object_id
   has_many :praise_treads, as: :praise_tread_object, dependent: :destroy
 
+  validates :content, length: { maximum: 5000 }
 
   validates :uuid, presence: true, uniqueness: true
 
diff --git a/app/models/shixun_info.rb b/app/models/shixun_info.rb
index 7f7aa364e..e3a8d334b 100644
--- a/app/models/shixun_info.rb
+++ b/app/models/shixun_info.rb
@@ -4,6 +4,8 @@ class ShixunInfo < ApplicationRecord
   validates_length_of :fork_reason, maximum: 60
   after_commit :create_diff_record
 
+  validates :description, length: { maximum: 5000 }
+
   private
 
   def create_diff_record
diff --git a/app/models/stage.rb b/app/models/stage.rb
index db7b5c0b3..84873b01f 100644
--- a/app/models/stage.rb
+++ b/app/models/stage.rb
@@ -7,5 +7,5 @@ class Stage < ApplicationRecord
   has_many :shixuns, :through => :stage_shixuns
 
   validates :name, length: { maximum: 60 }
-  validates :description, length: { maximum: 300 }
+  validates :description, length: { maximum: 1000 }
 end
diff --git a/app/models/test_set.rb b/app/models/test_set.rb
index 7772a3a00..f774610ee 100644
--- a/app/models/test_set.rb
+++ b/app/models/test_set.rb
@@ -1,3 +1,7 @@
 class TestSet < ApplicationRecord
   # match_rule: 匹配规则： full： 完全匹配， last： 末尾匹配
+  #
+  validates :input, length: { maximum: 500 }
+  validates :input, length: { maximum: 500 }
+
 end