diff --git a/Src/Asp.Net/OracleTest/UnitTest/ExpressionTest/Method.cs b/Src/Asp.Net/OracleTest/UnitTest/ExpressionTest/Method.cs
index ca1a060ae..7fee2e13e 100644
--- a/Src/Asp.Net/OracleTest/UnitTest/ExpressionTest/Method.cs
+++ b/Src/Asp.Net/OracleTest/UnitTest/ExpressionTest/Method.cs
@@ -363,9 +363,8 @@ namespace OrmTest.UnitTest
             expContext.Resolve(exp, ResolveExpressType.WhereSingle);
             var value = expContext.Result.GetString();
             var pars = expContext.Parameters;
-            base.Check(value, pars, "((DATEADD(:MethodConst2,:MethodConst1,:MethodConst0)) = :Const3 )", new List<SugarParameter>() {
-                new SugarParameter(":MethodConst0",x2),new SugarParameter(":MethodConst1",11),new SugarParameter(":Const3",x2),
-                new SugarParameter(":MethodConst2",DateType.Millisecond)
+            base.Check(value, pars, "((\"DATETIME2\"+0.0416666666666667) = :Const2 )", new List<SugarParameter>() {
+                new SugarParameter(":Const2",x2) 
             }, "DateAddByType error");
         }
         private void DateAddDay()
@@ -376,7 +375,7 @@ namespace OrmTest.UnitTest
             expContext.Resolve(exp, ResolveExpressType.WhereSingle);
             var value = expContext.Result.GetString();
             var pars = expContext.Parameters;
-            base.Check(value, pars, "((DATEADD(day,:MethodConst1,:MethodConst0)) = :Const2 )", new List<SugarParameter>() {
+            base.Check(value, pars, "((:MethodConst0+1) = :Const2 )", new List<SugarParameter>() {
                 new SugarParameter(":MethodConst0",x2),new SugarParameter(":MethodConst1",1),new SugarParameter(":Const2",x2)
             }, "DateAddDay error");
 
@@ -392,9 +391,9 @@ namespace OrmTest.UnitTest
             expContext.Resolve(exp, ResolveExpressType.WhereSingle);
             var value = expContext.Result.GetString();
             var pars = expContext.Parameters;
-            base.Check(value, pars, "((DATEADD(:Const0,:MethodConst1,\"DATETIME2\")) = :Const2 )", new List<SugarParameter>() {
-                new SugarParameter(":Const0",DateType.Hour.ToString()),new SugarParameter(":MethodConst1",10) 
-                ,new SugarParameter(":Const2",x2)
+            base.Check(value, pars, "((\"DATETIME2\"+0.0416666666666667) = :Const2 )", new List<SugarParameter>() {
+                new SugarParameter(":Const2",x2),
+                new SugarParameter(":MethodConst1",10)
             }, "DateAddDay2 error");
         }
 
@@ -406,9 +405,8 @@ namespace OrmTest.UnitTest
             expContext.Resolve(exp, ResolveExpressType.WhereSingle);
             var value = expContext.Result.GetString();
             var pars = expContext.Parameters;
-            base.Check(value, pars, "((DATEADD(:Const0,:MethodConst2,:MethodConst1)) = :Const3 )", new List<SugarParameter>() {
-                new SugarParameter(":Const0",DateType.Hour.ToString()),new SugarParameter(":MethodConst2",1),new SugarParameter(":MethodConst1",x2)
-                ,new SugarParameter(":Const3",x2)
+            base.Check(value, pars, "((:MethodConst1+0.0416666666666667) = :Const3 )", new List<SugarParameter>() {
+                new SugarParameter(":MethodConst1",x2),new SugarParameter(":MethodConst2",1),new SugarParameter(":Const3",x2)
             }, "DateAddDay3 error");
         }
 
diff --git a/Src/Asp.Net/SqlSugar/Realization/Oracle/SqlBuilder/OracleExpressionContext.cs b/Src/Asp.Net/SqlSugar/Realization/Oracle/SqlBuilder/OracleExpressionContext.cs
index 06e9506fc..0fd257758 100644
--- a/Src/Asp.Net/SqlSugar/Realization/Oracle/SqlBuilder/OracleExpressionContext.cs
+++ b/Src/Asp.Net/SqlSugar/Realization/Oracle/SqlBuilder/OracleExpressionContext.cs
@@ -45,14 +45,39 @@ namespace SqlSugar
             var parameter = model.Args[0];
             var parameter2 = model.Args[1];
             var parameter3 = model.Args[2];
-            return string.Format(" (DATEADD({2},{1},{0})) ", parameter.MemberName, parameter2.MemberName, parameter3.MemberValue);
+            var type = (DateType)Enum.Parse(typeof(DateType), parameter3.MemberValue.ObjToString(), false);
+            double time = 1;
+            switch (type)
+            {
+                case DateType.Year:
+                    time = 1 * 365;
+                    break;
+                case DateType.Month:
+                    time = 1 *30;
+                    break;
+                case DateType.Day:
+                    break;
+                case DateType.Hour:
+                    time = 1 / 24.0;
+                    break;
+                case DateType.Second:
+                    time = 1 / 24.0/60.0/60.0;
+                    break;
+                case DateType.Minute:
+                    time = 1 / 24.0/60.0;
+                    break;
+                case DateType.Millisecond:
+                    time = 1 / 24.0 / 60.0 / 60.0/1000;
+                    break;
+            }
+            return string.Format("({0}+{1}) ", parameter.MemberName, time);
         }
 
         public override string DateAddDay(MethodCallExpressionModel model)
         {
             var parameter = model.Args[0];
             var parameter2 = model.Args[1];
-            return string.Format(" (DATEADD(day,{1},{0})) ", parameter.MemberName, parameter2.MemberName);
+            return string.Format("({0}+1) ", parameter.MemberName);
         }
 
         public override string ToString(MethodCallExpressionModel model)