diff --git a/src/main/java/com/example/building/service/impl/OrderServiceImpl.java b/src/main/java/com/example/building/service/impl/OrderServiceImpl.java
index 0fbd7fb..f734cd7 100644
--- a/src/main/java/com/example/building/service/impl/OrderServiceImpl.java
+++ b/src/main/java/com/example/building/service/impl/OrderServiceImpl.java
@@ -121,8 +121,8 @@ public class OrderServiceImpl implements OrderService {
         BigDecimal discountRate = order.getDiscountRate();
         BigDecimal discountMoney = request.getDiscountMoney();
         
-        // 优先使用优惠金额，如果没有填则用折扣率计算
-        if (discountMoney != null && discountMoney.compareTo(BigDecimal.ZERO) > 0) {
+        // 如果优惠金额大于0，直接使用；否则用折扣率计算
+        if (discountMoney != null && discountMoney.compareTo(BigDecimal.ZERO) >= 0) {
             discountAmount = discountMoney;
         } else {
             // 折扣率默认100，即不打折
@@ -358,8 +358,8 @@ public class OrderServiceImpl implements OrderService {
         BigDecimal discountRate = order.getDiscountRate();
         BigDecimal discountMoney = order.getDiscountMoney();
         
-        // 优先使用优惠金额，如果没有填则用折扣率计算
-        if (discountMoney != null && discountMoney.compareTo(BigDecimal.ZERO) > 0) {
+        // 如果优惠金额大于等于0，直接使用；否则用折扣率计算
+        if (discountMoney != null && discountMoney.compareTo(BigDecimal.ZERO) >= 0) {
             discountAmount = discountMoney;
         } else {
             if (discountRate == null) {