diff --git a/Src/Asp.Net/SqlServerTest/UnitTest/ExpressionTest/Method.cs b/Src/Asp.Net/SqlServerTest/UnitTest/ExpressionTest/Method.cs
index 813c44807..f670ec85e 100644
--- a/Src/Asp.Net/SqlServerTest/UnitTest/ExpressionTest/Method.cs
+++ b/Src/Asp.Net/SqlServerTest/UnitTest/ExpressionTest/Method.cs
@@ -74,10 +74,25 @@ namespace OrmTest.UnitTest
                 Replace();
                 Length();
                 Time();
+
+                Test1();
             }
             base.End("Method Test");
         }
 
+        private void Test1()
+        {
+            var ids = new int[] { 1, 2, 3 };
+            Expression<Func<Student, bool>> exp = it => ids.Contains(it.Id)&&!SqlFunc.IsNullOrEmpty(it.Name);
+            SqlServerExpressionContext expContext = new SqlServerExpressionContext();
+            expContext.Resolve(exp, ResolveExpressType.WhereSingle);
+            var value = expContext.Result.GetString();
+            var pars = expContext.Parameters;
+            base.Check(value, pars, "(([Id] IN ('1','2','3')) AND NOT( [Name]='' OR [Name] IS NULL ))", new List<SugarParameter>() {
+           
+            }, "Test1 error");
+        }
+
         private void ExtendToString()
         {
             Expression<Func<Student, bool>> exp = it => it.Id.ToString() == "a";
diff --git a/Src/Asp.Net/SqlSugar/ExpressionsToSql/Common/ExpressionResult.cs b/Src/Asp.Net/SqlSugar/ExpressionsToSql/Common/ExpressionResult.cs
index 5d24e5f54..afe596dc9 100644
--- a/Src/Asp.Net/SqlSugar/ExpressionsToSql/Common/ExpressionResult.cs
+++ b/Src/Asp.Net/SqlSugar/ExpressionsToSql/Common/ExpressionResult.cs
@@ -52,6 +52,12 @@ namespace SqlSugar
                 _Result = value;
             }
         }
+        public bool LastCharIsSpace{
+            get {
+                if (_Result == null|| _Result.Length==0) return true;
+                return _Result.ToString().Last() == UtilConstants.SpaceChar;
+            }
+        }
         #endregion
         public string GetString()
         {
diff --git a/Src/Asp.Net/SqlSugar/ExpressionsToSql/ResolveItems/BaseResolve.cs b/Src/Asp.Net/SqlSugar/ExpressionsToSql/ResolveItems/BaseResolve.cs
index 0133e1026..8f67ff753 100644
--- a/Src/Asp.Net/SqlSugar/ExpressionsToSql/ResolveItems/BaseResolve.cs
+++ b/Src/Asp.Net/SqlSugar/ExpressionsToSql/ResolveItems/BaseResolve.cs
@@ -239,9 +239,10 @@ namespace SqlSugar
         protected void AppendNot(object Value)
         {
             var isAppend = !this.Context.Result.Contains(ExpressionConst.FormatSymbol);
+            var lastCharIsSpace = this.Context.Result.LastCharIsSpace;
             if (isAppend)
             {
-                this.Context.Result.Append("NOT");
+                this.Context.Result.Append(lastCharIsSpace?"NOT":" NOT");
             }
             else
             {
diff --git a/Src/Asp.Net/SqlSugar/Utilities/UtilConstants.cs b/Src/Asp.Net/SqlSugar/Utilities/UtilConstants.cs
index f89b173d9..224e05f84 100644
--- a/Src/Asp.Net/SqlSugar/Utilities/UtilConstants.cs
+++ b/Src/Asp.Net/SqlSugar/Utilities/UtilConstants.cs
@@ -9,6 +9,7 @@ namespace SqlSugar
         public const string Dot = ".";
         public const char DotChar = '.';
         internal const string Space = " ";
+        internal const char SpaceChar =' ';
         internal const string AssemblyName = "SqlSugar";
         internal const string ReplaceKey = "{662E689B-17A1-4D06-9D27-F29EAB8BC3D6}";