diff --git a/YLErpDAL/Modules/SwapModule/SwapDealService.cs b/YLErpDAL/Modules/SwapModule/SwapDealService.cs
index 05f67719..c60eccf5 100644
--- a/YLErpDAL/Modules/SwapModule/SwapDealService.cs
+++ b/YLErpDAL/Modules/SwapModule/SwapDealService.cs
@@ -402,6 +402,7 @@ namespace YLErp.Modules.SwapModule
                 // 根据场景计算利息
                 if (settment)
                 {
+                    calcLast = calcLast = td.trade_extend.ExtendObj.InterestCalcMode.EndsWith("1");//算尾
                     // 收盘归档场景，使用 CalcEodInterest
                     interests.Add(CalcEodInterest(td, valueDate, positionClone, rate, floatRate, closePrincipal, posiPrincipal, annualDays, calcFirst, calcLast, preEodPosition, eventType, add));
                 }
@@ -496,7 +497,6 @@ namespace YLErp.Modules.SwapModule
             bool calcToday = true;
             if (calcFirst == false && valueDate == td.StartDate.Value) calcToday = false; // 首日不算头
             if (calcLast == false && valueDate == td.ExerciseDate.Value) calcToday = false; // 到期日不算尾
-
             // 初始化EOD持仓信息
             if (preEod.id == 0)
             {
@@ -530,17 +530,26 @@ namespace YLErp.Modules.SwapModule
             decimal tdInterestAmount = 0;
             if (calcToday)
             {
-              
-                if (position.InterestType == (int)InterestTypeEnum.复利)
+                // 收盘自动互换场景，如果不算尾，当天是不产生利息的
+                if (calcLast == false && eventType == (int)SwapEventTypeEnum.自动互换)
                 {
-                    // 复利计算
-                    CalcDailyCompoundInterestByEod(preEod, valueDate, td.StartDate.Value, position, closePrincipal, posiPrincipal, interest, annualDays, false, eodFloatRate, 1m, posiPrincipal, ref interestAmount, ref tdInterestAmount);
+                    interestAmount= preEod.InterestProfitSum;
+                    tdInterestAmount = 0;
                 }
                 else
                 {
-                    // 单利计算
-                    CalcDailySimpleInterestByEod(preEod, valueDate, td.StartDate.Value, position, closePrincipal, posiPrincipal, interest, annualDays, false, eodFloatRate, 1m, posiPrincipal, ref interestAmount, ref tdInterestAmount);
+                    if (position.InterestType == (int)InterestTypeEnum.复利)
+                    {
+                        // 复利计算
+                        CalcDailyCompoundInterestByEod(preEod, valueDate, td.StartDate.Value, position, closePrincipal, posiPrincipal, interest, annualDays, false, eodFloatRate, 1m, posiPrincipal, ref interestAmount, ref tdInterestAmount);
+                    }
+                    else
+                    {
+                        // 单利计算
+                        CalcDailySimpleInterestByEod(preEod, valueDate, td.StartDate.Value, position, closePrincipal, posiPrincipal, interest, annualDays, false, eodFloatRate, 1m, posiPrincipal, ref interestAmount, ref tdInterestAmount);
+                    }
                 }
+                
             }
             // 四舍五入并赋值
             interest.InterestAmount = Math.Round(interestAmount, ConsGlobal.PriceRound, MidpointRounding.AwayFromZero);