diff --git a/app/models/item_analysis.rb b/app/models/item_analysis.rb
index dc1453982..e7177c2f8 100644
--- a/app/models/item_analysis.rb
+++ b/app/models/item_analysis.rb
@@ -1,3 +1,4 @@
 class ItemAnalysis < ApplicationRecord
   belongs_to :item_bank, touch: true
+  validates :analysis, length: { maximum: 5000, too_long: "不能超过5000个字符" }
 end
diff --git a/app/models/item_bank.rb b/app/models/item_bank.rb
index d22e421a3..71cfd07a4 100644
--- a/app/models/item_bank.rb
+++ b/app/models/item_bank.rb
@@ -14,7 +14,6 @@ class ItemBank < ApplicationRecord
 
   belongs_to :container, polymorphic: true, optional: true
   validates :name, presence: true, length: { maximum: 1000, too_long: "不能超过1000个字符" }
-  validates :analysis, length: { maximum: 5000, too_long: "不能超过5000个字符" }
 
   def analysis
     item_analysis&.analysis