diff --git a/cash-service/order-service/src/main/java/com/czg/service/order/print/FeiPrinter.java b/cash-service/order-service/src/main/java/com/czg/service/order/print/FeiPrinter.java
index 6ec647016..e571ee984 100644
--- a/cash-service/order-service/src/main/java/com/czg/service/order/print/FeiPrinter.java
+++ b/cash-service/order-service/src/main/java/com/czg/service/order/print/FeiPrinter.java
@@ -100,10 +100,8 @@ public class FeiPrinter extends PrinterHandler implements PrinterImpl {
                 .setBalance(balance).setPayType((ObjectUtil.isEmpty(orderInfo.getPayType()) || ObjectUtil.isNull(orderInfo.getPayType()) ? "" : orderInfo.getPayType())).setIntegral("0")
                 .setOutNumber(orderInfo.getTakeCode()).setPrintTitle("结算单")
                 .setRemark(orderInfo.getRemark())
-                // 使用累计的总优惠金额，null 表示没有优惠
-                .setDiscountAmount(orderInfo.getDiscountAllAmount() != null 
-                    ? orderInfo.getDiscountAllAmount().toPlainString() 
-                    : "0.00");
+                // 使用累计的总优惠金额，如果为 null 则用原价减去实付计算
+                .setDiscountAmount(calculateDiscountAmount(orderInfo));
 
         if (orderInfo.getPayAmount() != null && orderInfo.getPayAmount().compareTo(BigDecimal.ZERO) == 0) {
             // 设置支付金额为 订单原价-订单优惠金额
@@ -136,10 +134,8 @@ public class FeiPrinter extends PrinterHandler implements PrinterImpl {
                 .setBalance(balance).setPayType((ObjectUtil.isEmpty(orderInfo.getPayType()) || ObjectUtil.isNull(orderInfo.getPayType()) ? "" : orderInfo.getPayType())).setIntegral("0")
                 .setOutNumber(orderInfo.getTakeCode()).setPrintTitle("结算单")
                 .setRemark(orderInfo.getRemark())
-                // 使用累计的总优惠金额，null 表示没有优惠
-                .setDiscountAmount(orderInfo.getDiscountAllAmount() != null 
-                    ? orderInfo.getDiscountAllAmount().toPlainString() 
-                    : "0.00");
+                // 使用累计的总优惠金额，如果为 null 则用原价减去实付计算
+                .setDiscountAmount(calculateDiscountAmount(orderInfo));
         printInfoDTO.setPrintTitle(printInfoDTO.getPrintTitle());
         if (orderInfo.getSeatNum() != null && orderInfo.getSeatAmount().compareTo(BigDecimal.ZERO) > 0) {
             printInfoDTO.setSeatNum(orderInfo.getSeatNum().toString());
@@ -261,12 +257,18 @@ public class FeiPrinter extends PrinterHandler implements PrinterImpl {
     }
 
     /**
-     * 计算优惠金额：优先使用 discountAllAmount，如果为 null 则返回 0
+     * 计算优惠金额：优先使用 discountAllAmount，如果为 null 则用原价 - 实付计算
      */
     private String calculateDiscountAmount(OrderInfo orderInfo) {
-        return orderInfo.getDiscountAllAmount() != null 
-            ? orderInfo.getDiscountAllAmount().toPlainString() 
-            : "0.00";
+        if (orderInfo.getDiscountAllAmount() != null) {
+            return orderInfo.getDiscountAllAmount().toPlainString();
+        }
+        // 兜底计算：原价 + 餐位费 + 打包费 - 实付
+        BigDecimal originalTotal = orderInfo.getOriginAmount()
+                .add(orderInfo.getSeatAmount() != null ? orderInfo.getSeatAmount() : BigDecimal.ZERO)
+                .add(orderInfo.getPackFee() != null ? orderInfo.getPackFee() : BigDecimal.ZERO);
+        BigDecimal discount = originalTotal.subtract(orderInfo.getPayAmount());
+        return discount.compareTo(BigDecimal.ZERO) >= 0 ? discount.toPlainString() : "0.00";
     }
 
 }