diff --git a/backend/services/trading-service/src/application/services/order.service.ts b/backend/services/trading-service/src/application/services/order.service.ts
index debffd1b..4fac6d9b 100644
--- a/backend/services/trading-service/src/application/services/order.service.ts
+++ b/backend/services/trading-service/src/application/services/order.service.ts
@@ -254,15 +254,22 @@ export class OrderService {
             },
           });
 
-          // 4. 更新买方账户（扣除冻结现金）
-          // 做市商吃单时：积分股不进做市商账户，只进流通池（事务外处理）
-          // 普通用户买入时：积分股直接进入买方账户
+          // 4. 更新买方账户
+          // 做市商吃单时：
+          //   - 支付 sellerGrossAmount（含销毁倍数的交易总额），不是仅原始数量×价格
+          //   - 积分股不进做市商账户，只进流通池
+          // 普通用户买入时：
+          //   - 支付 buyerPayAmount（原始数量×价格）
+          //   - 积分股直接进入买方账户
           const buyerAccountRecord = await tx.tradingAccount.findUnique({
             where: { accountSequence: match.buyOrder.accountSequence },
           });
           if (buyerAccountRecord) {
+            // 做市商实际支付 = 交易总额（含销毁倍数）；普通用户支付 = 原始数量×价格
+            const actualBuyerCost = isBuyerMarketMaker ? sellerGrossAmount : buyerPayAmount;
+            // frozenCash 释放的是下单时冻结的原始金额
             const newFrozenCash = Number(buyerAccountRecord.frozenCash) - buyerPayAmount.value.toNumber();
-            const newCashBalance = Number(buyerAccountRecord.cashBalance) - buyerPayAmount.value.toNumber();
+            const newCashBalance = Number(buyerAccountRecord.cashBalance) - actualBuyerCost.value.toNumber();
             const newShareBalance = isBuyerMarketMaker
               ? Number(buyerAccountRecord.shareBalance)
               : Number(buyerAccountRecord.shareBalance) + tradeQuantity.value.toNumber();
@@ -279,21 +286,37 @@ export class OrderService {
             });
 
             // 记录买方交易流水
-            await tx.tradingTransaction.create({
-              data: {
-                accountSequence: match.buyOrder.accountSequence,
-                type: 'BUY',
-                assetType: 'SHARE',
-                amount: tradeQuantity.value,
-                balanceBefore: buyerAccountRecord.shareBalance,
-                balanceAfter: newShareBalance,
-                referenceId: match.trade.tradeNo,
-                referenceType: 'TRADE',
-                description: isBuyerMarketMaker
-                  ? '做市商吃单(积分股→流通池)'
-                  : '买入成交',
-              },
-            });
+            if (isBuyerMarketMaker) {
+              // 做市商：记录现金支出（交易总额）
+              await tx.tradingTransaction.create({
+                data: {
+                  accountSequence: match.buyOrder.accountSequence,
+                  type: 'BUY',
+                  assetType: 'CASH',
+                  amount: actualBuyerCost.value,
+                  balanceBefore: buyerAccountRecord.cashBalance,
+                  balanceAfter: newCashBalance,
+                  referenceId: match.trade.tradeNo,
+                  referenceType: 'TRADE',
+                  description: `做市商吃单(积分股→流通池), 交易总额${sellerGrossAmount.toFixed(4)}`,
+                },
+              });
+            } else {
+              // 普通用户：记录积分股收入
+              await tx.tradingTransaction.create({
+                data: {
+                  accountSequence: match.buyOrder.accountSequence,
+                  type: 'BUY',
+                  assetType: 'SHARE',
+                  amount: tradeQuantity.value,
+                  balanceBefore: buyerAccountRecord.shareBalance,
+                  balanceAfter: newShareBalance,
+                  referenceId: match.trade.tradeNo,
+                  referenceType: 'TRADE',
+                  description: '买入成交',
+                },
+              });
+            }
           }
 
           // 5. 更新卖方账户（扣除冻结积分股，增加现金）