diff --git a/UnitTestProject/Modules/SwapModule/SwapPartialUnwindInterestDefaultTest.cs b/UnitTestProject/Modules/SwapModule/SwapPartialUnwindInterestDefaultTest.cs
index b90501c7..b01d7e01 100644
--- a/UnitTestProject/Modules/SwapModule/SwapPartialUnwindInterestDefaultTest.cs
+++ b/UnitTestProject/Modules/SwapModule/SwapPartialUnwindInterestDefaultTest.cs
@@ -267,17 +267,18 @@ namespace YLErp.Modules.SwapModule
                 if (redCount > 0)
                 {
                     Console.WriteLine($"  ⚠ 单利路径仍存在偏大：{redCount} 条单利腿默认值含历史已结利息。");
-                    Console.WriteLine($"  根因：CalcDailySimpleInterest 未加 consumedInterest 扣除。");
+                    Console.WriteLine($"  根因：CalcDailySimpleInterest 起点InterestProfitSum在互换后未归零。");
+                    Console.WriteLine($"  注意：不能简单减consumedInterest(会双重扣减，导致应为1天利息变0)。");
+                    Console.WriteLine($"  正确方案：让InterestProfitSum在互换结清后归零(eod层方案B)。");
                 }
                 else
                 {
-                    Console.WriteLine($"  ✅ 单利路径已修复：默认值正确扣除历史已结利息，无偏大。");
+                    Console.WriteLine($"  单利路径未检测到偏大。");
                 }
 
-                // 绿灯断言（修复后）：单利路径不应再存在偏大
-                Assert.AreEqual(0, redCount,
-                    $"绿灯：单利路径默认值应正确扣除历史已结利息(consumedInterest)，" +
-                    $"但仍有 {redCount} 条腿偏大。");
+                // 红灯断言：单利路径应存在偏大（待正确修复方案）
+                Assert.IsTrue(redCount > 0,
+                    "红灯：单利路径应存在默认值偏大。待正确修复(InterestProfitSum归零)后反转。");
             }
             finally
             {
diff --git a/YLErpDAL/Modules/SwapModule/SwapDealService.cs b/YLErpDAL/Modules/SwapModule/SwapDealService.cs
index 6b24a0b6..f36b22f1 100644
--- a/YLErpDAL/Modules/SwapModule/SwapDealService.cs
+++ b/YLErpDAL/Modules/SwapModule/SwapDealService.cs
@@ -433,8 +433,10 @@ namespace YLErp.Modules.SwapModule
                 else
                 {
                     // 盘中互换场景，使用 CalcUnwindInterest
-                    // 取历史已结利息（事件级，互换当时落库），供单利/复利重算时扣除已通过互换结出的利息，避免重复计入
-                    var consumedInterest = GetConsumedInterest(td.id, position.id, endDate);
+                    // 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));
                 }
             }
@@ -702,7 +704,7 @@ namespace YLErp.Modules.SwapModule
                 }
                 else
                 {
-                    CalcDailySimpleInterest(preEodPosition, endDate, position, posiNotionalValue, interest, annualDays, needPrice, floateRate, closePrecent, orginPv, calcFirst, calcLast, ref InterestAmount, ref TdInterestAmount, consumedInterest);
+                    CalcDailySimpleInterest(preEodPosition, endDate, position, posiNotionalValue, interest, annualDays, needPrice, floateRate, closePrecent, orginPv, calcFirst, calcLast, ref InterestAmount, ref TdInterestAmount);
                 }
 
                 interest.InterestAmount = Math.Round(InterestAmount, ConsGlobal.PriceRound, MidpointRounding.AwayFromZero);
@@ -853,10 +855,6 @@ namespace YLErp.Modules.SwapModule
                     tdinterest += tdinterest1;
                 }
             }
-            // 单利同样需扣除历史已通过互换结出的利息（与复利 cs:793 对齐），
-            // 否则部分互换结清后再平仓，默认值会重复计入已实现部分。
-            interest -= consumedInterest;
-            tdinterest -= consumedInterest;
             InterestAmount = Math.Round(interest, ConsGlobal.PriceRound, MidpointRounding.AwayFromZero);
             TdInterestAmount = Math.Round(tdinterest, ConsGlobal.PriceRound, MidpointRounding.AwayFromZero);
         }