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 55a1245fc..e6090ac86 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，而不是倒推计算
-                .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));
         String string = buildOrderPrintData(printInfoDTO, detailList);
         String o = sendPrintRequest(machine.getAddress(), string, null, printerNum);
         printMachineLogService.save(orderInfo.getId(), machine, "结算单", string, o);
@@ -131,10 +129,8 @@ 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，而不是倒推计算
-                .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());
@@ -247,7 +243,7 @@ public class FeiPrinter extends PrinterHandler implements PrinterImpl {
             //成功 开机 {"msg":"ok","ret":0,"data":"在线，工作状态正常。","serverExecutedTime":4}
             //成功 离线 {"msg":"ok","ret":0,"data":"离线。","serverExecutedTime":7}
             JSONObject json = JSONUtil.parseObj(UnicodeUtil.toString(resp));
-            log.info("飞鹅打印机状态响应: {}", json);
+            log.info("飞鹅打印机状态响应：{}", json);
             msg = json.getStr("data");
         } catch (Exception e) {
             msg = "未知错误";
@@ -255,4 +251,19 @@ public class FeiPrinter extends PrinterHandler implements PrinterImpl {
         return msg;
     }
 
+    /**
+     * 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) {
+        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";
+    }
+
 }
diff --git a/cash-service/order-service/src/main/java/com/czg/service/order/print/YxyPrinter.java b/cash-service/order-service/src/main/java/com/czg/service/order/print/YxyPrinter.java
index f6c0d070d..18c80de43 100644
--- a/cash-service/order-service/src/main/java/com/czg/service/order/print/YxyPrinter.java
+++ b/cash-service/order-service/src/main/java/com/czg/service/order/print/YxyPrinter.java
@@ -133,10 +133,8 @@ public class YxyPrinter extends PrinterHandler implements PrinterImpl {
                 .setBalance(balance).setPayType((ObjectUtil.isEmpty(orderInfo.getPayType()) || ObjectUtil.isNull(orderInfo.getPayType()) ? "" : orderInfo.getPayType())).setIntegral("0")
                 .setOutNumber(orderInfo.getTakeCode()).setPrintTitle("退款单")
                 .setRemark(orderInfo.getRemark())
-                // 使用累计的总优惠金额，而不是倒推计算
-                .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));
 
         String data = buildOrderPrintData(printInfoDTO, detailList);
         String voiceJson = "{\"PbizType\":\"2\",\"content\":\"您有一笔新的订单，请及时处理\"}";
@@ -166,10 +164,8 @@ public class YxyPrinter extends PrinterHandler implements PrinterImpl {
                 .setPrintTitle(isPre ? "预结算单" : "结算单")
                 .setCount(count)
                 .setRemark(orderInfo.getRemark())
-                // 使用累计的总优惠金额，而不是倒推计算
-                .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());
@@ -264,4 +260,19 @@ public class YxyPrinter extends PrinterHandler implements PrinterImpl {
         return s;
     }
 
+    /**
+     * 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) {
+        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";
+    }
+
 }