diff --git a/YLErpDAL/Modules/SwapModule/SwapEodPositionService.cs b/YLErpDAL/Modules/SwapModule/SwapEodPositionService.cs
index f68558e0..230f99d3 100644
--- a/YLErpDAL/Modules/SwapModule/SwapEodPositionService.cs
+++ b/YLErpDAL/Modules/SwapModule/SwapEodPositionService.cs
@@ -30,6 +30,36 @@ namespace YLErp.Modules.SwapModule
         {
 
         }
+
+        #region 可测试化接缝（Seams）——override 这些虚方法可在测试中替换 DB/外部调用，生产代码行为不变
+
+        /// <summary>持久化 eod 持仓记录（生产: DbContext.Add；测试: 收集到列表）</summary>
+        protected virtual void PersistEodSwapPosition(eod_swap_position position)
+        {
+            if (position.id == 0)
+            {
+                DbContext.eod_swap_position.Add(position);
+            }
+            else
+            {
+                UpdateDbOption(position);
+            }
+        }
+
+        /// <summary>保存所有变更（生产: DbContext.SaveChanges；测试: 计数）</summary>
+        protected virtual void SaveAllChanges()
+        {
+            DbContext.SaveChanges();
+        }
+
+        /// <summary>获取汇率（生产: EodCurrencyRateService；测试: 返回固定值）</summary>
+        protected virtual double GetCurrencyRate(string quoteCurrency, string settlementCurrency, DateTime valueDate, bool seekPreday, CurrencyRateType currencyRateType)
+        {
+            return new EodCurrencyRateService(UserInfo).GetCurrencyRate(quoteCurrency, settlementCurrency, valueDate, seekPreday, currencyRateType);
+        }
+
+        #endregion
+
         /// <summary>
         /// 多空组合 互换流水合成持仓
         /// </summary>
@@ -845,13 +875,10 @@ namespace YLErp.Modules.SwapModule
             //累计已实现
             newEodPayPosition.RealizedInterest = eodPayPosition.RealizedInterest + newEodPayPosition.TdCloseInterest * ratio;
             newEodPayPosition.RealizedInterestFee = eodPayPosition.RealizedInterestFee + newEodPayPosition.TdCloseInterestFee;
-            var currencyRate = new EodCurrencyRateService(UserInfo).GetCurrencyRate(td.QuoteCurrency, td.SettlementCurrency, valueDate
-               , seekPreday: true, currencyRateType: position.InterestDirection == (int)SwapDirectionEnum.收取 ? CurrencyRateType.Buy : CurrencyRateType.Sell);
+            var currencyRate = GetCurrencyRate(td.QuoteCurrency, td.SettlementCurrency, valueDate, true,
+                position.InterestDirection == (int)SwapDirectionEnum.收取 ? CurrencyRateType.Buy : CurrencyRateType.Sell);
             newEodPayPosition.TdCurrency = Convert.ToDecimal(currencyRate);
-            if (newEodPayPosition.id == 0)
-            {
-                DbContext.eod_swap_position.Add(newEodPayPosition);
-            }
+            PersistEodSwapPosition(newEodPayPosition);
         }
         /// <summary>
         /// 自动互换用,当日无互换，当日无平仓
@@ -982,13 +1009,10 @@ namespace YLErp.Modules.SwapModule
             newEodPayPosition.RealizedInterest = eodPayPosition.RealizedInterest + newEodPayPosition.TdCloseInterest * ratio;
             newEodPayPosition.RealizedInterestFee = eodPayPosition.RealizedInterestFee + newEodPayPosition.TdCloseInterestFee;
             newEodPayPosition.RealizedPnl = newEodPayPosition.RealizedInterest + newEodPayPosition.RealizedInterestFee;
-            var currencyRate = new EodCurrencyRateService(UserInfo).GetCurrencyRate(td.QuoteCurrency, td.SettlementCurrency, valueDate
-               , seekPreday: true, currencyRateType: position.InterestDirection == (int)SwapDirectionEnum.收取 ? CurrencyRateType.Buy : CurrencyRateType.Sell);
+            var currencyRate = GetCurrencyRate(td.QuoteCurrency, td.SettlementCurrency, valueDate, true,
+                position.InterestDirection == (int)SwapDirectionEnum.收取 ? CurrencyRateType.Buy : CurrencyRateType.Sell);
             newEodPayPosition.TdCurrency = Convert.ToDecimal(currencyRate);
-            if (newEodPayPosition.id == 0)
-            {
-                DbContext.eod_swap_position.Add(newEodPayPosition);
-            }
+            PersistEodSwapPosition(newEodPayPosition);
             Log.Info($"the last newEodPayPosition is {JsonHelper.Serialize(newEodPayPosition, false)}");
             return interests;
         }
@@ -1120,14 +1144,11 @@ namespace YLErp.Modules.SwapModule
             newEodPayPosition.RealizedInterest = eodPayPosition.RealizedInterest + newEodPayPosition.TdCloseInterest * ratio;
             newEodPayPosition.RealizedInterestFee = eodPayPosition.RealizedInterestFee + newEodPayPosition.TdCloseInterestFee;
             newEodPayPosition.RealizedPnl = newEodPayPosition.RealizedInterest + newEodPayPosition.RealizedInterestFee; ;
-            var currencyRate = new EodCurrencyRateService(UserInfo).GetCurrencyRate(td.QuoteCurrency, td.SettlementCurrency, valueDate
-               , seekPreday: true, currencyRateType: position.InterestDirection == (int)SwapDirectionEnum.收取 ? CurrencyRateType.Buy : CurrencyRateType.Sell);
+            var currencyRate = GetCurrencyRate(td.QuoteCurrency, td.SettlementCurrency, valueDate, true,
+                position.InterestDirection == (int)SwapDirectionEnum.收取 ? CurrencyRateType.Buy : CurrencyRateType.Sell);
             newEodPayPosition.TdCurrency = Convert.ToDecimal(currencyRate);
             Log.Info($"即将插入数据库的 newEodPayPosition is {JsonHelper.Serialize(newEodPayPosition, false)}");
-            if (newEodPayPosition.id == 0)
-            {
-                DbContext.eod_swap_position.Add(newEodPayPosition);
-            }
+            PersistEodSwapPosition(newEodPayPosition);
             return interests;
         }
 
@@ -1245,14 +1266,11 @@ namespace YLErp.Modules.SwapModule
             newEodPayPosition.RealizedInterest = eodPayPosition.RealizedInterest + newEodPayPosition.TdCloseInterest * ratio;
             newEodPayPosition.RealizedInterestFee = eodPayPosition.RealizedInterestFee + newEodPayPosition.TdCloseInterestFee;
             newEodPayPosition.RealizedPnl = newEodPayPosition.RealizedInterest + newEodPayPosition.RealizedInterestFee;
-            var currencyRate = new EodCurrencyRateService(UserInfo).GetCurrencyRate(td.QuoteCurrency, td.SettlementCurrency, valueDate
-               , seekPreday: true, currencyRateType: eodPayPosition.InterestDirection == (int)SwapDirectionEnum.收取 ? CurrencyRateType.Buy : CurrencyRateType.Sell);
+            var currencyRate = GetCurrencyRate(td.QuoteCurrency, td.SettlementCurrency, valueDate, true,
+                eodPayPosition.InterestDirection == (int)SwapDirectionEnum.收取 ? CurrencyRateType.Buy : CurrencyRateType.Sell);
             newEodPayPosition.TdCurrency = Convert.ToDecimal(currencyRate);
             Log.Info($"the last newEodPayPosition is {JsonHelper.Serialize(newEodPayPosition, false)}");
-            if (newEodPayPosition.id == 0)
-            {
-                DbContext.eod_swap_position.Add(newEodPayPosition);
-            }
+            PersistEodSwapPosition(newEodPayPosition);
 
         }
         /// <summary>