diff --git a/Src/Asp.NetCore2/SqlSugar/ExpressionsToSql/Common/ExpressionTool.cs b/Src/Asp.NetCore2/SqlSugar/ExpressionsToSql/Common/ExpressionTool.cs
index 32269871e..71c8a5803 100644
--- a/Src/Asp.NetCore2/SqlSugar/ExpressionsToSql/Common/ExpressionTool.cs
+++ b/Src/Asp.NetCore2/SqlSugar/ExpressionsToSql/Common/ExpressionTool.cs
@@ -281,6 +281,15 @@ namespace SqlSugar
                                         expression.NodeType != ExpressionType.Or &&
                                         expression.NodeType != ExpressionType.OrElse;
         }
+        public static bool IsEqualOrLtOrGt(Expression expression)
+        {
+            return expression.NodeType== ExpressionType.Equal||
+                   expression.NodeType == ExpressionType.GreaterThan||
+                   expression.NodeType == ExpressionType.LessThan||
+                   expression.NodeType == ExpressionType.LessThanOrEqual ||
+                   expression.NodeType == ExpressionType.GreaterThanOrEqual 
+                   ;
+        }
         public static object GetMemberValue(MemberInfo member, Expression expression)
         {
             var rootExpression = expression as MemberExpression;
diff --git a/Src/Asp.NetCore2/SqlSugar/ExpressionsToSql/ResolveItems/BaseResolve_Item.cs b/Src/Asp.NetCore2/SqlSugar/ExpressionsToSql/ResolveItems/BaseResolve_Item.cs
index 66c983c03..5a17f73a3 100644
--- a/Src/Asp.NetCore2/SqlSugar/ExpressionsToSql/ResolveItems/BaseResolve_Item.cs
+++ b/Src/Asp.NetCore2/SqlSugar/ExpressionsToSql/ResolveItems/BaseResolve_Item.cs
@@ -244,7 +244,25 @@ namespace SqlSugar
                 {
                     this.Context.Parameters.AddRange(newContext.Parameters);
                 }
-                this.Context.Result.Append(this.Context.GetAsString(asName, newContext.Result.GetString()));
+                if (ExpressionTool.IsEqualOrLtOrGt(item))
+                {
+                    var sql = newContext.Result.GetString();
+                    var pTrue = AppendParameter(true);
+                    var pFalse = AppendParameter(false);
+                    sql =this.Context.DbMehtods.IIF(new MethodCallExpressionModel() {
+                     Args=new List<MethodCallExpressionArgs>() 
+                     { 
+                         new MethodCallExpressionArgs(){ MemberName=sql,MemberValue=sql,IsMember=true } ,
+                          new MethodCallExpressionArgs(){ MemberName=pTrue,MemberValue=pTrue,IsMember=true },
+                           new MethodCallExpressionArgs(){ MemberName=pFalse,MemberValue=pFalse,IsMember=true }
+                     }
+                    });
+                    this.Context.Result.Append(this.Context.GetAsString(asName, sql));
+                }
+                else
+                {
+                    this.Context.Result.Append(this.Context.GetAsString(asName, newContext.Result.GetString()));
+                }
                 this.Context.Result.CurrentParameter = null;
                 if (this.Context.SingleTableNameSubqueryShortName.IsNullOrEmpty() && newContext.SingleTableNameSubqueryShortName.HasValue())
                 {