diff --git a/Src/Asp.NetCore2/SqlSeverTest/UnitTest/Main.cs b/Src/Asp.NetCore2/SqlSeverTest/UnitTest/Main.cs
index 231fe1d39..01dc7b1f6 100644
--- a/Src/Asp.NetCore2/SqlSeverTest/UnitTest/Main.cs
+++ b/Src/Asp.NetCore2/SqlSeverTest/UnitTest/Main.cs
@@ -31,6 +31,7 @@ namespace OrmTest
         }
         public static void Init()
         {
+            UnitOneToOneDel.Init();
             EntityInfoTest.Init();
             UnitOneToManyafdaa.Init();
             Unitadfafa.Init();
diff --git a/Src/Asp.NetCore2/SqlSeverTest/UnitTest/UnitOneToOneDel.cs b/Src/Asp.NetCore2/SqlSeverTest/UnitTest/UnitOneToOneDel.cs
new file mode 100644
index 000000000..9b90f8424
--- /dev/null
+++ b/Src/Asp.NetCore2/SqlSeverTest/UnitTest/UnitOneToOneDel.cs
@@ -0,0 +1,55 @@
+using SqlSugar;
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace OrmTest
+{
+    internal class UnitOneToOneDel
+    {
+        public static void Init()
+        {
+            var Db = new SqlSugarScope(new ConnectionConfig()
+            {
+                DbType = DbType.SqlServer,
+                ConnectionString = Config.ConnectionString,
+                IsAutoCloseConnection = true
+            });
+            Db.CodeFirst.InitTables<School, Grade>();
+            Db.DbMaintenance.TruncateTable<School, Grade>();
+            Db.Insertable(new School()
+            {
+                Id = 1,
+                Name = "a"
+            }).ExecuteCommand();
+            Db.Insertable(new Grade()
+            {
+                 Name= "b",
+                  SchoolId=1,
+            }).ExecuteCommand();
+            Db.DeleteNav<School>(s => s.Id.Equals(4))
+                .Include(s => s.Grades).ExecuteCommandAsync().GetAwaiter().GetResult();
+            Console.ReadLine();
+
+        }
+    }
+
+    [SugarTable("unitSchooldfadsaa")]
+
+    public class School
+    {
+        [SqlSugar.SugarColumn(IsPrimaryKey = true, IsIdentity = true)]
+        public int Id { get; set; }
+        public string? Name { get; set; }
+        [Navigate(NavigateType.OneToOne, nameof(Grade.SchoolId))]
+        public Grade Grades { get; set; }
+    }
+    [SugarTable("unitGradedfadsaa")]
+    public class Grade
+    {
+        [SqlSugar.SugarColumn(IsPrimaryKey = true, IsIdentity = true)]
+        public int Id { get; set; }
+        public string? Name { get; set; }
+        public int SchoolId { get; set; }
+    }
+}