diff --git a/YLErpDAL/Modules/SwapModule/SwapEodPositionService.cs b/YLErpDAL/Modules/SwapModule/SwapEodPositionService.cs
index 6865b195..38004aa4 100644
--- a/YLErpDAL/Modules/SwapModule/SwapEodPositionService.cs
+++ b/YLErpDAL/Modules/SwapModule/SwapEodPositionService.cs
@@ -2611,18 +2611,13 @@ namespace YLErp.Modules.SwapModule
         }
 
         /// <summary>
-        /// 计算预付金利息。先按收取为正、支付为负转换为我方视角，
-        /// 再按日终本金绝对值加权平均；本金合计为零时返回零。
+        /// 计算预付金利息金额。InterestIncomeSum 已是各腿利息金额，
+        /// 按收取为正、支付为负直接轧差求和，不做本金加权。
         /// </summary>
         private static decimal CalculateWeightedMarginInterest(IEnumerable<eod_swap_position> margins)
         {
-            var marginList = margins.ToList();
-            var totalWeight = marginList.Sum(x => Math.Abs(x.InterestPrincipalFix));
-            return totalWeight == 0
-                ? 0
-                : marginList.Sum(x => x.InterestIncomeSum
-                                      * (x.InterestDirection == (int)SwapDirectionEnum.收取 ? 1 : -1)
-                                      * Math.Abs(x.InterestPrincipalFix)) / totalWeight;
+            return margins.Sum(x =>
+                x.InterestIncomeSum * (x.InterestDirection == (int)SwapDirectionEnum.收取 ? 1 : -1));
         }
         /// <summary>
         /// 将数据库中以公司/交易簿记方向保存的日终字段转换为客户视角。