diff --git a/UnitTestProject/Modules/SwapModule/FundingLegs/FundingLegStrategyTest.cs b/UnitTestProject/Modules/SwapModule/FundingLegs/FundingLegStrategyTest.cs
index cae1d332..b3d71a43 100644
--- a/UnitTestProject/Modules/SwapModule/FundingLegs/FundingLegStrategyTest.cs
+++ b/UnitTestProject/Modules/SwapModule/FundingLegs/FundingLegStrategyTest.cs
@@ -22,7 +22,7 @@ namespace UnitTestProject.Modules.SwapModule.FundingLegs
         [TestMethod]
         public void 固定值_部分平仓_计息基数恒等于Fix()
         {
-            var leg = new FixedNotionalLeg();
+            var leg = new FixedAmountLeg();
             var r = leg.CalcNotional(Fix, Notional, LongNotional, ShortNotional, 0.5m);
 
             Assert.AreEqual(Fix, r.ClosePrincipal, "平仓本金恒=Fix");
@@ -33,7 +33,7 @@ namespace UnitTestProject.Modules.SwapModule.FundingLegs
         [TestMethod]
         public void 固定值_全平_计息基数仍等于Fix()
         {
-            var leg = new FixedNotionalLeg();
+            var leg = new FixedAmountLeg();
             var r = leg.CalcNotional(Fix, Notional, LongNotional, ShortNotional, 1m);
             Assert.AreEqual(Fix, r.ClosePrincipal);
         }
@@ -78,7 +78,7 @@ namespace UnitTestProject.Modules.SwapModule.FundingLegs
         [TestMethod]
         public void 标的期初全价_部分平仓_主路径公式同mode2()
         {
-            var leg = new UnderlyingFullPriceLeg();
+            var leg = new UnderlyingEntryFullPriceLeg();
             var r = leg.CalcNotional(Fix, Notional, LongNotional, ShortNotional, 0.5m);
 
             Assert.AreEqual(50_000_000m, r.ClosePrincipal);
@@ -89,7 +89,7 @@ namespace UnitTestProject.Modules.SwapModule.FundingLegs
         [TestMethod]
         public void 标的期初全价_全平_本金等于全额()
         {
-            var leg = new UnderlyingFullPriceLeg();
+            var leg = new UnderlyingEntryFullPriceLeg();
             var r = leg.CalcNotional(Fix, Notional, LongNotional, ShortNotional, 1m);
             Assert.AreEqual(Notional, r.ClosePrincipal);
         }
@@ -101,9 +101,9 @@ namespace UnitTestProject.Modules.SwapModule.FundingLegs
         [TestMethod]
         public void 各策略对应正确枚举值()
         {
-            Assert.AreEqual(InterestModeEnum.固定值, new FixedNotionalLeg().Mode);
+            Assert.AreEqual(InterestModeEnum.固定值, new FixedAmountLeg().Mode);
             Assert.AreEqual(InterestModeEnum.合约名义本金规模, new ContractNotionalLeg().Mode);
-            Assert.AreEqual(InterestModeEnum.标的期初全价, new UnderlyingFullPriceLeg().Mode);
+            Assert.AreEqual(InterestModeEnum.标的期初全价, new UnderlyingEntryFullPriceLeg().Mode);
         }
 
         #endregion
@@ -113,9 +113,9 @@ namespace UnitTestProject.Modules.SwapModule.FundingLegs
         [TestMethod]
         public void 工厂_返回各活跃mode的策略()
         {
-            Assert.IsInstanceOfType(FundingLegStrategyFactory.Get(InterestModeEnum.固定值), typeof(FixedNotionalLeg));
+            Assert.IsInstanceOfType(FundingLegStrategyFactory.Get(InterestModeEnum.固定值), typeof(FixedAmountLeg));
             Assert.IsInstanceOfType(FundingLegStrategyFactory.Get(InterestModeEnum.合约名义本金规模), typeof(ContractNotionalLeg));
-            Assert.IsInstanceOfType(FundingLegStrategyFactory.Get(InterestModeEnum.标的期初全价), typeof(UnderlyingFullPriceLeg));
+            Assert.IsInstanceOfType(FundingLegStrategyFactory.Get(InterestModeEnum.标的期初全价), typeof(UnderlyingEntryFullPriceLeg));
         }
 
         [TestMethod]
diff --git a/YLErpDAL/Modules/SwapModule/FundingLegs/FixedNotionalLeg.cs b/YLErpDAL/Modules/SwapModule/FundingLegs/FixedAmountLeg.cs
similarity index 64%
rename from YLErpDAL/Modules/SwapModule/FundingLegs/FixedNotionalLeg.cs
rename to YLErpDAL/Modules/SwapModule/FundingLegs/FixedAmountLeg.cs
index fd85793c..6e477b07 100644
--- a/YLErpDAL/Modules/SwapModule/FundingLegs/FixedNotionalLeg.cs
+++ b/YLErpDAL/Modules/SwapModule/FundingLegs/FixedAmountLeg.cs
@@ -1,14 +1,14 @@
 using YLErp.DBModels;
-using YLErp.Modules.SwapModule.FundingLegs;
 
 namespace YLErp.Modules.SwapModule.FundingLegs;
 
 /// <summary>
 /// 固定值融资腿（InterestMode=固定值）。
 /// 计息基数由合约约定（InterestPrincipalFix），无论平仓比例多少都恒等于该值。
-/// 业务规则：固定值就是合同写死的固定值，永远不变。
+/// 业务规则：固定值就是合同写死的固定数额(Amount)，永远不变。
+/// 不叫 FixedNotionalLeg——"固定值"不一定是"名义本金(Notional)"，避免与 ContractNotionalLeg 概念撞车。
 /// </summary>
-public sealed class FixedNotionalLeg : IFundingLegStrategy
+public sealed class FixedAmountLeg : IFundingLegStrategy
 {
     public InterestModeEnum Mode => InterestModeEnum.固定值;
 
diff --git a/YLErpDAL/Modules/SwapModule/FundingLegs/FundingLegStrategyFactory.cs b/YLErpDAL/Modules/SwapModule/FundingLegs/FundingLegStrategyFactory.cs
index a909ec5e..ee4114ef 100644
--- a/YLErpDAL/Modules/SwapModule/FundingLegs/FundingLegStrategyFactory.cs
+++ b/YLErpDAL/Modules/SwapModule/FundingLegs/FundingLegStrategyFactory.cs
@@ -17,9 +17,9 @@ public static class FundingLegStrategyFactory
 {
     private static readonly Dictionary<InterestModeEnum, IFundingLegStrategy> _strategies = new()
     {
-        [InterestModeEnum.固定值] = new FixedNotionalLeg(),
+        [InterestModeEnum.固定值] = new FixedAmountLeg(),
         [InterestModeEnum.合约名义本金规模] = new ContractNotionalLeg(),
-        [InterestModeEnum.标的期初全价] = new UnderlyingFullPriceLeg(),
+        [InterestModeEnum.标的期初全价] = new UnderlyingEntryFullPriceLeg(),
     };
 
     /// <summary>按 mode 返回对应策略。未注册的 mode 抛 ArgumentException。</summary>
diff --git a/YLErpDAL/Modules/SwapModule/FundingLegs/UnderlyingFullPriceLeg.cs b/YLErpDAL/Modules/SwapModule/FundingLegs/UnderlyingEntryFullPriceLeg.cs
similarity index 75%
rename from YLErpDAL/Modules/SwapModule/FundingLegs/UnderlyingFullPriceLeg.cs
rename to YLErpDAL/Modules/SwapModule/FundingLegs/UnderlyingEntryFullPriceLeg.cs
index 725717fd..f78d9b74 100644
--- a/YLErpDAL/Modules/SwapModule/FundingLegs/UnderlyingFullPriceLeg.cs
+++ b/YLErpDAL/Modules/SwapModule/FundingLegs/UnderlyingEntryFullPriceLeg.cs
@@ -4,12 +4,13 @@ namespace YLErp.Modules.SwapModule.FundingLegs;
 
 /// <summary>
 /// 标的期初全价融资腿（InterestMode=标的期初全价）。
-/// 站在"持仓全价"视角：计息基数 = 标的含费全价(PosiGrossPrice/EntryDirtyPrice) × 数量。
+/// 计息基数 = 标的期初含费全价(PosiGrossPrice/EntryDirtyPrice) × 数量。
+/// "期初(Entry)"是关键——建仓时点的全价，非当前估值全价。
 /// 主路径 CalcNotionalByMode 公式与合约名义本金规模(2)相同；
 /// 差异在衡泰路径会乘 grossPrice 折算（SwapDealService.GetUnwindInterestsByHT），
 /// 以及 EOD 复利部分平仓后直接返回剩余本金（禁止反推，SwapEodPositionService:1458-1465）。
 /// </summary>
-public sealed class UnderlyingFullPriceLeg : IFundingLegStrategy
+public sealed class UnderlyingEntryFullPriceLeg : IFundingLegStrategy
 {
     public InterestModeEnum Mode => InterestModeEnum.标的期初全价;
 
diff --git a/YLErpDAL/Modules/SwapModule/ReturnLegs/DividendCalc.cs b/YLErpDAL/Modules/SwapModule/ReturnLegs/DividendCalc.cs
index 1b9f898f..d2472360 100644
--- a/YLErpDAL/Modules/SwapModule/ReturnLegs/DividendCalc.cs
+++ b/YLErpDAL/Modules/SwapModule/ReturnLegs/DividendCalc.cs
@@ -1,18 +1,27 @@
 namespace YLErp.Modules.SwapModule.ReturnLegs;
 
 /// <summary>
-/// 标的端分红（票息）计算。
+/// 标的端分红/票息的增值税计算。
 ///
-/// 增值税后票息 = 税前票息 / (1+税率) × (1-税率)
-/// 原代码在 SwapEodPositionService 4处重复此公式(1804/1894/1906/2095)。
+/// 业务含义：TRS 标的如果是债券，标的端会收到债券票息(coupon)；
+/// 如果是股票，会收到现金分红(cash dividend)。系统统一用 Dividend 字段链路表达。
+/// 本类只负责"增值税后金额"这一步纯数学，不涉及取价/归属/落库。
+///
+/// 税务口径：票息/分红属于金融服务应税收入，先除以(1+税率)还原不含税收入，
+/// 再乘以(1-税率)扣减税负。公式：afterTax = payment / (1+tax) × (1-tax)。
+/// 原代码在 SwapEodPositionService 4处 + SwapDealService 1处 重复此公式。
+///
+/// 命名保持 DividendCalc 而非改为 CashFlow/Coupon——
+/// 因为系统里"分红"字段(DividendIn/PosiDividendSum)是统一链路，同时覆盖债券票息和股票分红，
+/// 改名会制造新歧义且需同步改 DB 字段，收益不匹配。
 /// </summary>
 public static class DividendCalc
 {
-    /// <summary>增值税后票息，四舍五入到 2 位。</summary>
+    /// <summary>增值税后票息/分红，四舍五入到分(2位)。</summary>
     public static decimal AfterTax(decimal payment, decimal tax)
         => Math.Round(payment / (1 + tax) * (1 - tax), 2);
 
-    /// <summary>增值税后票息（不四舍五入，供中间计算用）。</summary>
+    /// <summary>增值税后票息/分红（不四舍五入，供中间计算用）。</summary>
     public static decimal AfterTaxRaw(decimal payment, decimal tax)
         => payment / (1 + tax) * (1 - tax);
 }