diff --git a/YLErpDAL/Modules/SwapModule/SwapDealService.cs b/YLErpDAL/Modules/SwapModule/SwapDealService.cs
index 18ade2a8..a8ee764f 100644
--- a/YLErpDAL/Modules/SwapModule/SwapDealService.cs
+++ b/YLErpDAL/Modules/SwapModule/SwapDealService.cs
@@ -338,6 +338,27 @@ namespace YLErp.Modules.SwapModule
             interests = GetInterests(td, tradeExtend, valueDate, unwindDate, lastEodPositions, positions, stockEqvNotional, posiLongNotionalValue, posiShortNotionalValue, posiNotionalValue, closePercent, eventType, tdClose, false, grossPrice ?? 0, orginPv, true, false,false, closeList);
             return interests;
         }
+
+        /// <summary>
+        /// 获取利息腿"已通过历史互换结出的累计利息"（用于复利重算时扣除，类比分红的 CalcConsumedDividend）。
+        /// 数据源为事件级 swap_flow_event.InterestAmount（互换/自动互换 完成态事件，互换当时即落库，不依赖日终归档）。
+        /// </summary>
+        /// <param name="tradeId">交易id</param>
+        /// <param name="positionId">利息腿id</param>
+        /// <param name="beforeDate">结算日（不含，仅汇总此日之前的历史已结利息；当日事件由 closeList 去重逻辑单独处理）</param>
+        /// <returns>历史已结利息累计金额（绝对值）</returns>
+        public decimal GetConsumedInterest(int tradeId, long positionId, DateTime beforeDate)
+        {
+            List<int> swapEventTypes = new List<int>() { (int)SwapEventTypeEnum.互换, (int)SwapEventTypeEnum.自动互换 };
+            var consumed = DbContext.swap_flow_event
+                .Where(x => x.SwapTradeId == tradeId && x.PositionId == positionId
+                    && swapEventTypes.Contains(x.EventType)
+                    && x.DataState == (int)SwapFlowDateStateEnum.完成
+                    && x.EventDate < beforeDate)
+                .Sum(s => (decimal?)s.InterestAmount) ?? 0m;
+            return consumed;
+        }
+
         /// <summary>
         /// 计算利息腿计息详细
         /// </summary>
@@ -412,7 +433,11 @@ namespace YLErp.Modules.SwapModule
                 else
                 {
                     // 盘中互换场景，使用 CalcUnwindInterest
-                    interests.Add(CalcUnwindInterest(td, valueDate, endDate, positionClone, rate, floatRate, posiPrincipal, closePrincipal, newClosePercent, annualDays, preEodPosition, eventType, add, swap, orginPv, calcFirst, calcLast||newCalcLast));
+                    // 取历史已结利息（事件级，互换当时落库），供复利重算扣除（仅复利需要；单利基于日终快照自带状态）
+                    var consumedInterest = position.InterestType == (int)InterestTypeEnum.复利
+                        ? GetConsumedInterest(td.id, position.id, endDate)
+                        : 0m;
+                    interests.Add(CalcUnwindInterest(td, valueDate, endDate, positionClone, rate, floatRate, posiPrincipal, closePrincipal, newClosePercent, annualDays, preEodPosition, eventType, add, swap, orginPv, calcFirst, calcLast||newCalcLast, consumedInterest));
                 }
             }
             //当日有平仓或互换记录时，避免重复结算
@@ -592,7 +617,7 @@ namespace YLErp.Modules.SwapModule
         /// <summary>
         /// 计算盘中利息（平仓/互换）
         /// </summary>
-        private swap_flow_event CalcUnwindInterest(trade td, DateTime valueDate, DateTime endDate,  swap_position position, decimal rate, decimal floatRate, decimal posiPrincipal, decimal closePrincipal, decimal closePercent, int annualDays, eod_swap_position preEod, int eventType, bool add, bool swap, decimal orginPv, bool calcFirst, bool calcLast)
+        private swap_flow_event CalcUnwindInterest(trade td, DateTime valueDate, DateTime endDate,  swap_position position, decimal rate, decimal floatRate, decimal posiPrincipal, decimal closePrincipal, decimal closePercent, int annualDays, eod_swap_position preEod, int eventType, bool add, bool swap, decimal orginPv, bool calcFirst, bool calcLast, decimal consumedInterest = 0m)
         {
             if (preEod.id == 0)
             {
@@ -606,7 +631,7 @@ namespace YLErp.Modules.SwapModule
                 }
             }
 
-            return InitSwapDealInterest(td, valueDate, endDate,  rate, position, add, swap, posiPrincipal, closePrincipal, closePercent, annualDays, eventType, preEod, false, orginPv, calcFirst, calcLast);
+            return InitSwapDealInterest(td, valueDate, endDate,  rate, position, add, swap, posiPrincipal, closePrincipal, closePercent, annualDays, eventType, preEod, false, orginPv, calcFirst, calcLast, consumedInterest);
         }
         /// <summary>
         /// 初始化利息腿信息
@@ -638,8 +663,9 @@ namespace YLErp.Modules.SwapModule
             eod_swap_position preEodPosition,
             bool needPrice,
             decimal orginPv,
-            bool calcFirst, 
-            bool calcLast
+            bool calcFirst,
+            bool calcLast,
+            decimal consumedInterest = 0m
             )
         {
             decimal interestProfitSum = preEodPosition.InterestProfitSum;
@@ -674,7 +700,7 @@ namespace YLErp.Modules.SwapModule
                 var floateRate = preEodPosition.FloatRate;
                 if (position.InterestType == (int)InterestTypeEnum.复利)
                 {
-                    CalcDailyCompoundInterest( endDate,  position, closePosiNotionalValue, interest, annualDays, needPrice, floateRate, closePrecent, orginPv, calcFirst, calcLast, ref InterestAmount, ref TdInterestAmount);
+                    CalcDailyCompoundInterest( endDate,  position, closePosiNotionalValue, interest, annualDays, needPrice, floateRate, closePrecent, orginPv, calcFirst, calcLast, ref InterestAmount, ref TdInterestAmount, consumedInterest);
                 }
                 else
                 {
@@ -702,7 +728,7 @@ namespace YLErp.Modules.SwapModule
         /// <param name="isAnnualized">是否年化</param>
         /// <param name="annualDays">年化天数</param>
         /// <returns></returns>
-        public void CalcDailyCompoundInterest( DateTime endDate, swap_position position, decimal principal, swap_flow_event flowEvent, int annualDays, bool needPrice, decimal floateRate, decimal closePercent, decimal orginPv, bool calcFirst, bool calcLast, ref decimal InterestAmount, ref decimal TdInterestAmount)
+        public void CalcDailyCompoundInterest( DateTime endDate, swap_position position, decimal principal, swap_flow_event flowEvent, int annualDays, bool needPrice, decimal floateRate, decimal closePercent, decimal orginPv, bool calcFirst, bool calcLast, ref decimal InterestAmount, ref decimal TdInterestAmount, decimal consumedInterest = 0m)
         {
             var startDate = position.PosiStartDate;
             decimal interestProfitSum = 0;
@@ -761,6 +787,11 @@ namespace YLErp.Modules.SwapModule
                     tdinterest += tdinterest1;
                 }
             }
+            // 复利从头重放得到的是"假设从未结出"的整段总利息，需扣除历史已通过互换结出的利息，
+            // 否则已结部分会重复计息（类比分红 PosiDividendSum = totalToDate − RealizedDividend）。
+            // consumedInterest 为绝对值口径（swap_flow_event.InterestAmount 之和），与 interest 口径一致。
+            interest -= consumedInterest;
+            tdinterest -= consumedInterest;
             InterestAmount = Math.Round(interest, ConsGlobal.PriceRound, MidpointRounding.AwayFromZero);
             TdInterestAmount = Math.Round(tdinterest, ConsGlobal.PriceRound, MidpointRounding.AwayFromZero);
         }