diff --git a/erp/sale/change.go b/erp/sale/change.go
index e872b43..8af6a87 100644
--- a/erp/sale/change.go
+++ b/erp/sale/change.go
@@ -30,3 +30,13 @@ func (c *change) All(ctx context.Context, args ArgsChangeAllSearch) (reply []Cha
 	err = xClient.Call(ctx, "All", args, &reply)
 	return
 }
+
+// Benefit @TITLE 效益测算
+func (c *change) Benefit(ctx context.Context, args ArgsAppendBenefit) (reply ReplyBenefitInfo, err error) {
+	xClient, err := client.GetClient(c)
+	if err != nil {
+		return
+	}
+	err = xClient.Call(ctx, "Benefit", args, &reply)
+	return
+}