diff --git a/Src/Asp.Net/OracleTest/Demo/Demo1_Queryable.cs b/Src/Asp.Net/OracleTest/Demo/Demo1_Queryable.cs
index 86bd28d8d..a733075a1 100644
--- a/Src/Asp.Net/OracleTest/Demo/Demo1_Queryable.cs
+++ b/Src/Asp.Net/OracleTest/Demo/Demo1_Queryable.cs
@@ -53,6 +53,14 @@ namespace OrmTest
                 ).ToList();
             var test2 = db.Queryable<Order>().Select<ViewOrder>().ToList();
             var test3 = db.Queryable<Order>().Select(it=>new Order() { CreateTime=SqlFunc.GetDate() }).ToList();
+            var btime = Convert.ToDateTime("2021-2-1");
+            var etime = Convert.ToDateTime("2022-1-12");
+            var test01 = db.Queryable<Order>().Select(it => SqlFunc.DateDiff(DateType.Year, btime, etime)).ToList();
+            var test02 = db.Queryable<Order>().Select(it => SqlFunc.DateDiff(DateType.Day, btime, etime)).ToList();
+            var test03 = db.Queryable<Order>().Select(it => SqlFunc.DateDiff(DateType.Month, btime, etime)).ToList();
+            var test04 = db.Queryable<Order>().Select(it => SqlFunc.DateDiff(DateType.Second, DateTime.Now, DateTime.Now.AddMinutes(2))).ToList();
+            var test05 = db.Queryable<Order>().Select(it => SqlFunc.DateDiff(DateType.Minute, DateTime.Now, DateTime.Now.AddMinutes(21))).ToList();
+            var test06 = db.Queryable<Order>().Select(it => SqlFunc.DateDiff(DateType.Hour, DateTime.Now, DateTime.Now.AddHours(3))).ToList();
             Console.WriteLine("#### Examples End ####");
         }
 
diff --git a/Src/Asp.Net/SqlSugar/Realization/Oracle/SqlBuilder/OracleExpressionContext.cs b/Src/Asp.Net/SqlSugar/Realization/Oracle/SqlBuilder/OracleExpressionContext.cs
index 18049ff6b..e5891bd7b 100644
--- a/Src/Asp.Net/SqlSugar/Realization/Oracle/SqlBuilder/OracleExpressionContext.cs
+++ b/Src/Asp.Net/SqlSugar/Realization/Oracle/SqlBuilder/OracleExpressionContext.cs
@@ -53,6 +53,33 @@ namespace SqlSugar
     }
     public partial class OracleMethod : DefaultDbMethod, IDbMethods
     {
+
+        public override string DateDiff(MethodCallExpressionModel model)
+        {
+            var parameter = (DateType)(Enum.Parse(typeof(DateType), model.Args[0].MemberValue.ObjToString()));
+            var begin = model.Args[1].MemberName;
+            var end = model.Args[2].MemberName;
+            switch (parameter)
+            {
+                case DateType.Year:
+                    return $" ( cast((months_between( {end} ,  {begin}))/12 as number(9,0) ) )";
+                case DateType.Month:
+                    return $" ( cast((months_between( {end} ,  {begin})) as number(9,0) ) )";
+                case DateType.Day:
+                    return $" ( ROUND(TO_NUMBER({end} - {begin}))  )";
+                case DateType.Hour:
+                    return $" ( ROUND(TO_NUMBER({end} - {begin}) * 24)  )";
+                case DateType.Minute:
+                    return $" ( ROUND(TO_NUMBER({end} - {begin}) * 24 * 60) )";
+                case DateType.Second:
+                    return $" ( ROUND(TO_NUMBER({end} - {begin}) * 24 * 60 * 60) )";
+                case DateType.Millisecond:
+                    return $" ( ROUND(TO_NUMBER({end} - {begin}) * 24 * 60 * 60 * 60) )";
+                default:
+                    break;
+            }
+            throw new Exception(parameter + " datediff no support");
+        }
         private void PageEach<T>(IEnumerable<T> pageItems, int pageSize, Action<List<T>> action)
         {
             if (pageItems != null && pageItems.Any())