diff --git a/app/models/merchant.py b/app/models/merchant.py
index eb29341..5f2ca23 100644
--- a/app/models/merchant.py
+++ b/app/models/merchant.py
@@ -52,7 +52,7 @@ class MerchantCreate(BaseModel):
     business_hours: str = Field(..., max_length=100)
     address: str = Field(..., max_length=200)
     longitude: float = Field(..., ge=-180, le=180, description="经度")
-    latitude: float = Field(..., ge=-180, le=180, description="纬度")
+    latitude: float = Field(..., ge=-90, le=90, description="纬度")
     phone: str = Field(..., max_length=20, pattern=r'^\d+$')
     images: List[MerchantImage] = []
 
@@ -61,7 +61,7 @@ class MerchantUpdate(BaseModel):
     business_hours: Optional[str] = Field(None, max_length=100)
     address: Optional[str] = Field(None, max_length=200)
     longitude: Optional[float] = Field(None, ge=-180, le=180, description="经度")
-    latitude: Optional[float] = Field(None, ge=-180, le=180, description="纬度")
+    latitude: Optional[float] = Field(None, ge=-90, le=90, description="纬度")
     phone: Optional[str] = Field(None, max_length=20, pattern=r'^\d+$')
     images: Optional[List[MerchantImage]] = None