diff --git a/UnitTestProject/Modules/TradeModule/DocGenerateModule/GuolianContractNoGeneratorTest.cs b/UnitTestProject/Modules/TradeModule/DocGenerateModule/GuolianContractNoGeneratorTest.cs
new file mode 100644
index 00000000..14580fd3
--- /dev/null
+++ b/UnitTestProject/Modules/TradeModule/DocGenerateModule/GuolianContractNoGeneratorTest.cs
@@ -0,0 +1,70 @@
+using YLErp.Configuration;
+using YLErp.DBModels;
+using YLErp.Modules.TradeModule.DocGenerateModule;
+
+namespace YLErp.UnitTestProject.Modules.TradeModule.DocGenerateModule
+{
+    [TestClass]
+    public class GuolianContractNoGeneratorTest
+    {
+        [TestMethod]
+        public void IsGuolianSwapTrade_OnlyMatchesGuolianSwap()
+        {
+            var swapTrade = CreateSwapTrade();
+
+            Assert.IsTrue(GuolianContractNoGenerator.IsGuolianSwapTrade(swapTrade, CompanyEnum.国联));
+            Assert.IsFalse(GuolianContractNoGenerator.IsGuolianSwapTrade(
+                new trade { TradeType = "香草期权" }, CompanyEnum.国联));
+            Assert.IsFalse(GuolianContractNoGenerator.IsGuolianSwapTrade(swapTrade, CompanyEnum.国泰君安));
+        }
+
+        [TestMethod]
+        public void ShouldGenerateTradeNumberAfterSave_OnlyGeneratesForBlankTradeNumber()
+        {
+            var blankTrade = CreateSwapTrade();
+            var manualTrade = CreateSwapTrade();
+            manualTrade.TradeNumber = "MANUAL-001";
+
+            Assert.IsTrue(GuolianContractNoGenerator.ShouldGenerateTradeNumberAfterSave(
+                blankTrade, CompanyEnum.国联));
+            Assert.IsFalse(GuolianContractNoGenerator.ShouldGenerateTradeNumberAfterSave(
+                manualTrade, CompanyEnum.国联));
+            Assert.IsFalse(GuolianContractNoGenerator.ShouldGenerateTradeNumberAfterSave(
+                blankTrade, CompanyEnum.国泰君安));
+        }
+
+        [TestMethod]
+        public void BuildTradeNumber_ClientTrade_UsesNumericSequenceAndSanitizesUnderlyingCode()
+        {
+            var trade = CreateSwapTrade();
+            trade.OpponentRole = "甲方";
+            trade.TradeDate = new DateTime(2026, 7, 24);
+            trade.UnderlyingCode = "250210.IB";
+
+            var number = GuolianContractNoGenerator.BuildTradeNumber(trade, "IS", 3);
+
+            Assert.AreEqual("GLMS-IS-20260724-FICC-03-250210IB", number);
+        }
+
+        [DataTestMethod]
+        [DataRow(1, "A")]
+        [DataRow(26, "Z")]
+        [DataRow(27, "AA")]
+        public void BuildTradeNumber_NonClientTrade_UsesLetterSequence(int sequenceNo, string sequenceCode)
+        {
+            var trade = CreateSwapTrade();
+            trade.OpponentRole = "乙方";
+            trade.TradeDate = new DateTime(2026, 7, 24);
+            trade.UnderlyingCode = "180205.IB";
+
+            var number = GuolianContractNoGenerator.BuildTradeNumber(trade, "glmscounter", sequenceNo);
+
+            Assert.AreEqual($"GLMS-glmscounter-20260724-FICC-{sequenceCode}-180205IB", number);
+        }
+
+        private static trade CreateSwapTrade()
+        {
+            return new trade { TradeType = "收益互换" };
+        }
+    }
+}
diff --git a/YLErpDAL/Modules/TradeModule/DocGenerateModule/GuolianContractNoGenerator.cs b/YLErpDAL/Modules/TradeModule/DocGenerateModule/GuolianContractNoGenerator.cs
index 5b858026..1d03dde8 100644
--- a/YLErpDAL/Modules/TradeModule/DocGenerateModule/GuolianContractNoGenerator.cs
+++ b/YLErpDAL/Modules/TradeModule/DocGenerateModule/GuolianContractNoGenerator.cs
@@ -20,10 +20,26 @@ namespace YLErp.Modules.TradeModule.DocGenerateModule
 
         public static bool IsGuolianSwapTrade(trade trade)
         {
-            return PS.Config.Company == CompanyEnum.国联
+            return IsGuolianSwapTrade(trade, PS.Config.Company);
+        }
+
+        public static bool IsGuolianSwapTrade(trade trade, CompanyEnum company)
+        {
+            return company == CompanyEnum.国联
                 && trade?.TradeType == "收益互换";
         }
 
+        public static bool ShouldGenerateTradeNumberAfterSave(trade trade, CompanyEnum company)
+        {
+            return IsGuolianSwapTrade(trade, company)
+                && string.IsNullOrWhiteSpace(trade.TradeNumber);
+        }
+
+        public static bool CanReuseRejectedTradeNumber(trade trade, CompanyEnum company)
+        {
+            return IsGuolianSwapTrade(trade, company);
+        }
+
         /// <summary>
         /// 交易首次入库后按国联交易确认书编号规则回写交易编号。
         /// </summary>