diff --git a/business/partner/purchase/jdshop/callback.go b/business/partner/purchase/jdshop/callback.go
index 00cdfda13..a7a22a3f4 100644
--- a/business/partner/purchase/jdshop/callback.go
+++ b/business/partner/purchase/jdshop/callback.go
@@ -157,7 +157,7 @@ func setJdsOrderSeq(order *model.GoodsOrder) (err error) {
 
 func Decrypt(p string) (result string) {
 	data, _ := base64.StdEncoding.DecodeString(strings.ReplaceAll(p, " ", "+"))
-	key := GetKey(hex.EncodeToString(data)[4:20])
+	key := GetKey(hex.EncodeToString(data)[4:36])
 	data2, _ := base64.StdEncoding.DecodeString(key)
 	b := bytes.NewBuffer(data)
 	b.Next(18)