diff --git a/YLErpDAL/Modules/SwapModule/SwapDealService.cs b/YLErpDAL/Modules/SwapModule/SwapDealService.cs
index c9605a21..4183bece 100644
--- a/YLErpDAL/Modules/SwapModule/SwapDealService.cs
+++ b/YLErpDAL/Modules/SwapModule/SwapDealService.cs
@@ -10,6 +10,7 @@ using YLErp.Modules.DataProviderModule;
 using YLErp.Modules.EodModule;
 using YLErp.Modules.TradeModule;
 using YLErp.Modules.TradeModule.DealModule;
+using YLErp.Modules.SwapModule.InterestLegs;
 using YLErp.QdpModule;
 
 namespace YLErp.Modules.SwapModule
@@ -898,20 +899,31 @@ namespace YLErp.Modules.SwapModule
         }
 
         /// <summary>
-        /// 根据计息模式计算名义本金
+        /// 根据计息模式计算名义本金。
+        /// 融资腿(mode 1/2/9)已委托 InterestLegStrategyFactory；保证金(mode 5/6)和
+        /// 半禁用的多空存续(mode 7/8)暂保留原逻辑，待 Margin 上下文接入后再迁出。
         /// </summary>
         private (decimal close, decimal posi, decimal closePct) CalcNotionalByMode(swap_position position, decimal closePercent, decimal posiNotional, decimal posiLong, decimal posiShort)
         {
-            decimal closePrincipal = posiNotional; // 平仓部分的名义本金
-            decimal posiPrincipal = posiNotional; // 持仓部分的名义本金
-            decimal newClosePercent = closePercent; // 调整后的平仓比例
+            var mode = (InterestModeEnum)position.InterestMode;
 
-            switch ((InterestModeEnum)position.InterestMode)
+            // 融资腿(1/2/9)走策略工厂
+            if (mode == InterestModeEnum.固定值
+                || mode == InterestModeEnum.合约名义本金规模
+                || mode == InterestModeEnum.标的期初全价)
+            {
+                var r = InterestLegStrategyFactory.Get(mode)
+                    .CalcNotional(position.InterestPrincipalFix, posiNotional, posiLong, posiShort, closePercent);
+                return (r.ClosePrincipal, r.PosiPrincipal, r.ClosePercent);
+            }
+
+            // 以下 mode 尚未迁入新架构，保留原逻辑
+            decimal closePrincipal = posiNotional;
+            decimal posiPrincipal = posiNotional;
+            decimal newClosePercent = closePercent;
+
+            switch (mode)
             {
-                case InterestModeEnum.固定值:
-                    closePrincipal = posiPrincipal = position.InterestPrincipalFix;
-                    newClosePercent = 1m;
-                    break;
                 case InterestModeEnum.多头存续名义本金:
                     closePrincipal = posiLong * closePercent;
                     posiPrincipal = posiLong;
@@ -920,12 +932,6 @@ namespace YLErp.Modules.SwapModule
                     closePrincipal = posiShort * closePercent;
                     posiPrincipal = posiShort;
                     break;
-                case InterestModeEnum.合约名义本金规模:
-                    closePrincipal = posiNotional * closePercent;
-                    break;
-                case InterestModeEnum.标的期初全价:
-                    closePrincipal = posiNotional * closePercent;
-                    break;
                 case InterestModeEnum.追加预付金:
                 case InterestModeEnum.初始预付金:
                     closePrincipal = position.InterestPrincipalFix * closePercent;