diff --git a/business/model/print_bill.go b/business/model/print_bill.go
index 392571beb..5db788612 100644
--- a/business/model/print_bill.go
+++ b/business/model/print_bill.go
@@ -17,7 +17,3 @@ func (v *PrintBill) TableUnique() [][]string {
 		[]string{"PrintNo"},
 	}
 }
-
-func (v *PrintBill) TableIndex() [][]string {
-	return [][]string{}
-}