diff --git a/platformapi/jdapi/sku.go b/platformapi/jdapi/sku.go
index 2a28130b..02b39170 100644
--- a/platformapi/jdapi/sku.go
+++ b/platformapi/jdapi/sku.go
@@ -51,6 +51,10 @@ const (
 	KeyWeight             = "weight"
 )
 
+const (
+	MaxBatchSize4BatchUpdateOutSkuId = 50
+)
+
 type SkuIDPair struct {
 	SkuId    int64  `json:"skuId"`
 	OutSkuId string `json:"outSkuId"`