diff --git a/server/marketserver/api/v1/recharge/recharge.go b/server/marketserver/api/v1/recharge/recharge.go
index bbfb03bc..c89eea53 100644
--- a/server/marketserver/api/v1/recharge/recharge.go
+++ b/server/marketserver/api/v1/recharge/recharge.go
@@ -125,7 +125,7 @@ func (this *RechargeApi) Buy(c *gin.Context) {
 		Calls   []jccommon.ContractCall `json:"calls"`
 	}{}
 	var itemNum int32 = reqJson.Num
-	var diamond int64 = currencyMeta.GetExchangeRate() * int64(1)
+	var diamond int64 = currencyMeta.GetExchangeRate() * int64(1) * int64(itemNum)
 	url := fmt.Sprintf("%s/webapp/index.php", mt.Table.Web3SignCluster.RandElement().GetUrl())
 	f5.GetHttpCliMgr().SendGoStyleRequest(
 		url,