diff --git a/SqlServerTest/UnitTest/ExpressionTest/Method.cs b/SqlServerTest/UnitTest/ExpressionTest/Method.cs
index 5f199c61c..05c24cf2c 100644
--- a/SqlServerTest/UnitTest/ExpressionTest/Method.cs
+++ b/SqlServerTest/UnitTest/ExpressionTest/Method.cs
@@ -26,6 +26,7 @@ namespace OrmTest.UnitTest
                 StringIsNullOrEmpty2();
                 StringIsNullOrEmpty3();
                 StringIsNullOrEmpty4();
+                StringIsNullOrEmpty5();
                 #endregion
                 ToUpper();
                 ToLower();
@@ -448,7 +449,19 @@ namespace OrmTest.UnitTest
                 new SugarParameter("@MethodConst1","xx"),
                 new SugarParameter("@Id0",2)
             }, "StringIsNullOrEmpty4 error");
-        } 
+        }
+        private void StringIsNullOrEmpty5()
+        {
+            WhereConst.name = "xx";
+            Expression<Func<Student, bool>> exp =it=>!SqlFunc.IsNullOrEmpty(WhereConst.name);;
+            SqlServerExpressionContext expContext = new SqlServerExpressionContext();
+            expContext.Resolve(exp, ResolveExpressType.WhereSingle);
+            var value = expContext.Result.GetString();
+            var pars = expContext.Parameters;
+            base.Check(value, pars, "NOT( @MethodConst0='' OR @MethodConst0 IS NULL )", new List<SugarParameter>() {
+               new SugarParameter("@MethodConst0","xx")
+            }, "StringIsNullOrEmpty5 error");
+        }
         #endregion
     }
 }
diff --git a/SqlSugar/ExpressionsToSql/ResolveItems/BaseResolve.cs b/SqlSugar/ExpressionsToSql/ResolveItems/BaseResolve.cs
index 4c6a0a91e..dd87c29af 100644
--- a/SqlSugar/ExpressionsToSql/ResolveItems/BaseResolve.cs
+++ b/SqlSugar/ExpressionsToSql/ResolveItems/BaseResolve.cs
@@ -180,5 +180,9 @@ namespace SqlSugar
                 this.Context.Result.Append(" " + ExpressionConst.Format1 + parameter.BaseParameter.Index);
             }
         }
+        protected void AppendNot(object Value)
+        {
+            this.Context.Result.Append("NOT");
+        }
     }
 }
diff --git a/SqlSugar/ExpressionsToSql/ResolveItems/UnaryExpressionResolve.cs b/SqlSugar/ExpressionsToSql/ResolveItems/UnaryExpressionResolve.cs
index 0e8945cb0..cb1c6fcbd 100644
--- a/SqlSugar/ExpressionsToSql/ResolveItems/UnaryExpressionResolve.cs
+++ b/SqlSugar/ExpressionsToSql/ResolveItems/UnaryExpressionResolve.cs
@@ -20,12 +20,15 @@ namespace SqlSugar
                 case ResolveExpressType.SelectSingle:
                 case ResolveExpressType.SelectMultiple:
                 case ResolveExpressType.Update:
+                    var nodeType = expression.NodeType;
                     base.Expression = expression.Operand;
-                    if (base.Expression is BinaryExpression||parameter.BaseExpression is BinaryExpression)
+                    if (base.Expression is BinaryExpression || parameter.BaseExpression is BinaryExpression)
                     {
                         BaseParameter.ChildExpression = base.Expression;
                         parameter.CommonTempData = CommonTempDataType.Default;
                         base.Start();
+                        if (nodeType == ExpressionType.Not)
+                            AppendNot(parameter.CommonTempData);
                         parameter.BaseParameter.CommonTempData = parameter.CommonTempData;
                         parameter.BaseParameter.ChildExpression = base.Expression;
                         parameter.CommonTempData = null;
@@ -34,6 +37,19 @@ namespace SqlSugar
                     {
                         BaseParameter.ChildExpression = base.Expression;
                         parameter.CommonTempData = CommonTempDataType.ChildNodeSet;
+                        if (nodeType == ExpressionType.Not)
+                            AppendNot(parameter.CommonTempData);
+                        base.Start();
+                        parameter.BaseParameter.CommonTempData = parameter.CommonTempData;
+                        parameter.BaseParameter.ChildExpression = base.Expression;
+                        parameter.CommonTempData = null;
+                    }
+                    else
+                    {
+                        BaseParameter.ChildExpression = base.Expression;
+                        parameter.CommonTempData = CommonTempDataType.ChildNodeSet;
+                        if (nodeType == ExpressionType.Not)
+                            AppendNot(parameter.CommonTempData);
                         base.Start();
                         parameter.BaseParameter.CommonTempData = parameter.CommonTempData;
                         parameter.BaseParameter.ChildExpression = base.Expression;