diff --git a/YLErpDAL/Modules/SwapModule/SwapDealService.cs b/YLErpDAL/Modules/SwapModule/SwapDealService.cs
index ecb68d59..818d1d3c 100644
--- a/YLErpDAL/Modules/SwapModule/SwapDealService.cs
+++ b/YLErpDAL/Modules/SwapModule/SwapDealService.cs
@@ -114,8 +114,8 @@ namespace YLErp.Modules.SwapModule
             return unwindData.ClosePercent == 1 || (remainingNotional == 0 && remainingQuantity == 0);
         }
 
-        // 待实现利息会进入 decimal(30,12) 日终快照
-        private const int InterestCalculationPrecision = 12;
+        // 待实现利息会进入 decimal(30,12) 日终快照；精度常量统一引用 SwapInterest.FundingLegPrecision，消除重复定义。
+        private const int InterestCalculationPrecision = SwapInterest.FundingLegPrecision;
 
         /// <summary>
         /// 手工平仓、手工互换及收益结算的利息事件按金额两位落库。
@@ -1583,8 +1583,8 @@ namespace YLErp.Modules.SwapModule
             // 利率构成按腿型封装：固定腿 → FixedRate；浮动腿 → Spread + IndexFixing（沿用旧实现 InterestRate+浮动利率 的口径）。
             var isFixedLeg = string.IsNullOrEmpty(position.FloatRateUnderlyingCode);
             var legRate = isFixedLeg
-                ? new FundingLegRate(fixedRate: flowEvent.InterestRate)
-                : new FundingLegRate(spread: flowEvent.InterestRate, indexFixing: effectiveFloat);
+                ? FundingLegRate.Fixed(flowEvent.InterestRate)
+                : FundingLegRate.Floating(flowEvent.InterestRate, effectiveFloat);
             var accrualPolicy = new AccrualPolicy(
                 convention: AccrualBoundary.Both,
                 isCompound: false,