diff --git a/platformapi/ebaiapi/shop_sku.go b/platformapi/ebaiapi/shop_sku.go
index 30c27568..fe3f36c1 100644
--- a/platformapi/ebaiapi/shop_sku.go
+++ b/platformapi/ebaiapi/shop_sku.go
@@ -19,7 +19,8 @@ const (
 	UPCTypePrivate  = 0
 )
 const (
-	MaxLeftNum = 99999
+	MaxLeftNum          = 99999
+	MaxSkuNameByteCount = 100 // skuname的最大字节数，注意不是字符数，超长饿百会报错：{"data":"","errno":20200,"error":"invalid param:[name]...
 )
 
 type CategoryInfo struct {
diff --git a/platformapi/jdapi/sku.go b/platformapi/jdapi/sku.go
index 7665b411..9c5239db 100644
--- a/platformapi/jdapi/sku.go
+++ b/platformapi/jdapi/sku.go
@@ -80,7 +80,7 @@ const (
 )
 
 const (
-	MaxSkuNameLen       = 45 // skuname最长字符数
+	MaxSkuNameCharCount = 45 // skuname最长字符数
 	SaleAttrIDBase      = 1001
 	SaleAttrValueIDBase = 10
 )
diff --git a/platformapi/mtwmapi/retail.go b/platformapi/mtwmapi/retail.go
index 9790068e..549a5411 100644
--- a/platformapi/mtwmapi/retail.go
+++ b/platformapi/mtwmapi/retail.go
@@ -6,6 +6,10 @@ import (
 	"git.rosy.net.cn/baseapi/utils"
 )
 
+const (
+	MaxSkuNameCharCount = 30 // SkuName的最大字符数
+)
+
 type RetailCategoryInfo struct {
 	Name     string                `json:"name"`
 	Sequence int                   `json:"sequence"`
diff --git a/utils/utils.go b/utils/utils.go
index d3a91485..445c7c42 100644
--- a/utils/utils.go
+++ b/utils/utils.go
@@ -247,7 +247,7 @@ func Base64DecodeMultiString(strs ...string) (decodedData [][]byte, err error) {
 	return decodedData, nil
 }
 
-// 只适合与纯英文的情况
+// 限制的是字节数，只适合纯英文的情况，推荐使用LimitMixedStringLen，除非确定是纯英文，且对性能相当敏感
 func LimitStringLen(str string, maxByteCount int) (limitedStr string) {
 	if maxByteCount > 0 {
 		if strLen := len(str); strLen > maxByteCount {