diff --git a/backend/api/types/open.py b/backend/api/types/open.py
index 2b4a40cc..f9ca745a 100644
--- a/backend/api/types/open.py
+++ b/backend/api/types/open.py
@@ -111,9 +111,9 @@ class SkillDetail(BaseModel):
     """特殊功能"""
     maxLevel: int = Field(..., description='等级上限')
     """等级上限"""
-    requiredLevel: int = Field(..., description='学习等级')
+    requiredLevel: int | None = Field(..., description='学习等级')
     """学习等级"""
-    requiredLevelRange: int = Field(..., description='学习间隔')
+    requiredLevelRange: int | None = Field(..., description='学习间隔')
     """学习间隔"""
     preRequiredSkill: list[IPreSkill] | None = Field(None, description='前置技能')
     """前置技能"""