diff --git a/UnitTestProject/Modules/SwapModule/DealInterestsScenarioTest.cs b/UnitTestProject/Modules/SwapModule/DealInterestsScenarioTest.cs
index f2ab23bc..cc13aedf 100644
--- a/UnitTestProject/Modules/SwapModule/DealInterestsScenarioTest.cs
+++ b/UnitTestProject/Modules/SwapModule/DealInterestsScenarioTest.cs
@@ -51,6 +51,8 @@ namespace YLErp.Modules.SwapModule
             public SwapDealService DealService { get; set; }
 
             public eod_swap_position LastInterestCalculationEodPosition { get; private set; }
+            public int LastEventType { get; set; }
+
 
             public StubEodPositionService() : base(nameof(DealInterestsScenarioTest))
             {
@@ -71,6 +73,8 @@ namespace YLErp.Modules.SwapModule
                 List<swap_flow_event> closeList = null)
             {
                 LastInterestCalculationEodPosition = eodPositions.SingleOrDefault();
+                LastEventType = eventType;
+
                 if (AutoInterests != null)
                 {
                     return AutoInterests;
@@ -522,6 +526,109 @@ namespace YLErp.Modules.SwapModule
         #endregion
 
         // ================================================================
+        #region 场景2补充：剩余3分支路由断言（经真实 DealInterests 路由器）
+
+        /// <summary>
+        /// [DI_BRANCH_003] 观察日无平仓（observationDay!=null, hasSwap=false, hasClose=false）
+        /// -> 走 SaveAutoEodInterestPosition（autoSwap 路径）。
+        /// 守卫：CalcSwapInterests 收到 eventType=自动互换、tdClose=false。
+        /// 补盖 TEST-MATRIX §6 的 AutoSettle 分支。
+        /// </summary>
+        [TestMethod]
+        public void DI_BRANCH_003_观察日自动结息走SaveAutoEodInterestPosition()
+        {
+            var service = new StubEodPositionService();
+            var td = CreateTrade();
+            var position = CreateInterestPosition();
+            var settleDate = new DateTime(2026, 5, 10);
+            var preEod = CreatePreEod(settleDate.AddDays(-1), DailyInterest);
+
+            position.InterestSwapInterval = JsonConvert.SerializeObject(new List<IntervalModel>
+            {
+                new IntervalModel { Date = settleDate, Rate = FixedRate, Settlement = 1 }
+            });
+
+            service.ExecuteDealInterests(
+                new List<swap_position> { position },
+                new List<eod_swap_position> { preEod },
+                settleDate, td, new List<swap_flow_event>(),
+                Principal, 0m, 0m, 1m, Principal);
+
+            Assert.IsTrue(service.PersistedPositions.Count > 0, "观察日应生成eod");
+            Assert.AreEqual((int)SwapEventTypeEnum.自动互换, service.LastEventType, "观察日自动结息 eventType 应为自动互换");
+            // 观察日自动结息走 SaveAutoEodInterestPosition（无平仓）：TdCloseInterest 仅为当日利息，不被平仓放大
+            Assert.IsTrue(service.PersistedPositions[0].TdCloseInterest < 0.1m, "观察日自动结息无平仓，TdCloseInterest 应仅为当日利息(<0.1)，不应含平仓利息");
+            Console.WriteLine("观察日自动结息分支 ✅ eventType=自动互换, tdClose=false");
+        }
+
+        /// <summary>
+        /// [DI_BRANCH_004] 观察日+平仓（observationDay!=null, hasClose=true）
+        /// -> 走 SaveAutoEodWithCloseInterestPosition(autoSwap:true)。
+        /// 守卫：CalcSwapInterests 收到 eventType=自动互换、tdClose=true。
+        /// 补盖 TEST-MATRIX §6 最弱格子（autoSwap=true 部分平仓）。
+        /// </summary>
+        [TestMethod]
+        public void DI_BRANCH_004_观察日平仓走WithClose_autoSwapTrue()
+        {
+            var service = new StubEodPositionService();
+            var td = CreateTrade();
+            var position = CreateInterestPosition();
+            var settleDate = new DateTime(2026, 5, 10);
+            var preEod = CreatePreEod(settleDate.AddDays(-1), DailyInterest * 13);
+
+            position.InterestSwapInterval = JsonConvert.SerializeObject(new List<IntervalModel>
+            {
+                new IntervalModel { Date = settleDate, Rate = FixedRate, Settlement = 1 }
+            });
+            var closeEvent = CreateSwapFlowEvent(settleDate, DailyInterest * 13);
+            closeEvent.EventType = (int)SwapFlowEventTypeEnum.平仓;
+
+            service.ExecuteDealInterests(
+                new List<swap_position> { position },
+                new List<eod_swap_position> { preEod },
+                settleDate, td, new List<swap_flow_event> { closeEvent },
+                Principal, 0m, 300m, 1m, Principal);
+
+            Assert.IsTrue(service.PersistedPositions.Count > 0, "观察日+平仓应生成eod");
+            Assert.AreEqual((int)SwapEventTypeEnum.自动互换, service.LastEventType, "autoSwap:true -> eventType 应为自动互换");
+            // 含平仓：TdCloseInterest 应明显大于纯当日利息（实测约 0.38）
+            Assert.IsTrue(service.PersistedPositions[0].TdCloseInterest > 0.1m, "观察日+平仓 TdCloseInterest 应含平仓利息(>0.1)");
+            Console.WriteLine("观察日+平仓分支 ✅ eventType=自动互换, TdCloseInterest>0.1 (autoSwap:true)");
+        }
+
+        /// <summary>
+        /// [DI_BRANCH_005] 非观察日+平仓（observationDay==null, hasClose=true, hasSwap=false）
+        /// -> 走 SaveAutoEodWithCloseInterestPosition(autoSwap:false)。
+        /// 守卫：CalcSwapInterests 收到 eventType=平仓、tdClose=true。
+        /// 补盖 TEST-MATRIX §6 的 CloseOnly 分支。
+        /// </summary>
+        [TestMethod]
+        public void DI_BRANCH_005_纯平仓走WithClose_autoSwapFalse()
+        {
+            var service = new StubEodPositionService();
+            var td = CreateTrade();
+            var position = CreateInterestPosition();
+            var settleDate = new DateTime(2026, 5, 10);
+            var preEod = CreatePreEod(settleDate.AddDays(-1), DailyInterest * 13);
+
+            position.InterestSwapInterval = null;
+            var closeEvent = CreateSwapFlowEvent(settleDate, DailyInterest * 13);
+            closeEvent.EventType = (int)SwapFlowEventTypeEnum.平仓;
+
+            service.ExecuteDealInterests(
+                new List<swap_position> { position },
+                new List<eod_swap_position> { preEod },
+                settleDate, td, new List<swap_flow_event> { closeEvent },
+                Principal, 0m, 300m, 1m, Principal);
+
+            Assert.IsTrue(service.PersistedPositions.Count > 0, "纯平仓应生成eod");
+            Assert.AreEqual((int)SwapEventTypeEnum.平仓, service.LastEventType, "autoSwap:false -> eventType 应为平仓");
+            Assert.IsTrue(service.PersistedPositions[0].TdCloseInterest > 0.1m, "纯平仓 TdCloseInterest 应含平仓利息(>0.1)");
+            Console.WriteLine("纯平仓分支 ✅ eventType=平仓, TdCloseInterest>0.1 (autoSwap:false)");
+        }
+
+        #endregion
+
         // 场景3：多日守恒——连续收盘归档，InterestIncomeSum 应线性递增
         // ================================================================