diff --git a/ruoyi-system/src/main/java/com/ruoyi/jarvis/service/impl/InstructionServiceImpl.java b/ruoyi-system/src/main/java/com/ruoyi/jarvis/service/impl/InstructionServiceImpl.java
index c736a61..917cb23 100644
--- a/ruoyi-system/src/main/java/com/ruoyi/jarvis/service/impl/InstructionServiceImpl.java
+++ b/ruoyi-system/src/main/java/com/ruoyi/jarvis/service/impl/InstructionServiceImpl.java
@@ -318,7 +318,7 @@ public class InstructionServiceImpl implements IInstructionService {
                     double rebateAmount = globalRebateAmounts.getOrDefault(model, 0.0);
                     int count = entry.getValue();
                     
-                    // 计算单台价格（总付款金额 / 数量）
+                    // 计算单台价格（总付款金额 / 数量）用于显示
                     double singlePayment = count > 0 ? paymentAmount / count : 0.0;
                     double singleRebate = count > 0 ? rebateAmount / count : 0.0;
                     
@@ -333,17 +333,18 @@ public class InstructionServiceImpl implements IInstructionService {
                         // 如果获取失败，佣金为0
                     }
                     
-                    // 计算净价（单台价格 - 返现 + 佣金）
-                    double netPrice = singlePayment - singleRebate + commission;
-                    // 计算总价
-                    double totalPrice = netPrice * count;
+                    // 用总金额计算，避免精度损失：总价 = 总付款 - 总返现 + (佣金 × 数量)
+                    double totalPrice = paymentAmount - rebateAmount + (commission * count);
                     grandTotal += totalPrice;
                     
+                    // 计算净价用于显示（总价 / 数量）
+                    double netPrice = count > 0 ? totalPrice / count : 0.0;
+                    
                     // 格式：单台价格-返现+佣金=净价×数量=总价
                     if (count == 1) {
                         // 数量为1时，不显示×1
                         calculationLines.append(String.format("%.1f-%.0f+%.0f=%.1f\n", 
-                            singlePayment, singleRebate, commission, netPrice));
+                            singlePayment, singleRebate, commission, totalPrice));
                     } else {
                         calculationLines.append(String.format("%.1f-%.0f+%.0f=%.1f×%d=%.1f\n", 
                             singlePayment, singleRebate, commission, netPrice, count, totalPrice));
@@ -364,9 +365,6 @@ public class InstructionServiceImpl implements IInstructionService {
                         double rebateAmount = globalRebateAmounts.getOrDefault(model, 0.0);
                         int count = entry.getValue();
                         
-                        double singlePayment = count > 0 ? paymentAmount / count : 0.0;
-                        double singleRebate = count > 0 ? rebateAmount / count : 0.0;
-                        
                         double commission = 0.0;
                         try {
                             com.ruoyi.jarvis.domain.ProductJdConfig config = productJdConfigService.selectProductJdConfigByModel(model);
@@ -376,8 +374,8 @@ public class InstructionServiceImpl implements IInstructionService {
                         } catch (Exception e) {
                         }
                         
-                        double netPrice = singlePayment - singleRebate + commission;
-                        double totalPrice = netPrice * count;
+                        // 用总金额计算
+                        double totalPrice = paymentAmount - rebateAmount + (commission * count);
                         
                         if (i > 0) {
                             summaryFormula.append("+");