diff --git a/src/main/java/com/chaozhanggui/system/cashierservice/service/PayService.java b/src/main/java/com/chaozhanggui/system/cashierservice/service/PayService.java
index 063091f..7cf3b00 100644
--- a/src/main/java/com/chaozhanggui/system/cashierservice/service/PayService.java
+++ b/src/main/java/com/chaozhanggui/system/cashierservice/service/PayService.java
@@ -1626,7 +1626,7 @@ public class PayService {
             if(staff.getMaxDiscountAmount().compareTo(tbOrderInfo.getOrderAmount())>=0){
                 staff.setMaxDiscountAmount(BigDecimal.ONE);
             }else {
-                staff.setMaxDiscountAmount(staff.getMaxDiscountAmount().divide(tbOrderInfo.getOrderAmount(),2,RoundingMode.HALF_UP).setScale(2,RoundingMode.HALF_UP));
+                staff.setMaxDiscountAmount(BigDecimal.ONE.subtract(staff.getMaxDiscountAmount().divide(tbOrderInfo.getOrderAmount(),2,RoundingMode.HALF_UP).setScale(2,RoundingMode.HALF_UP)));
             }
 
         }