diff --git a/Src/Asp.NetCore2/ClickHouseTest/Demo/Demo0_SqlSugarClient.cs b/Src/Asp.NetCore2/ClickHouseTest/Demo/Demo0_SqlSugarClient.cs
index 4076a3796..08a8bae56 100644
--- a/Src/Asp.NetCore2/ClickHouseTest/Demo/Demo0_SqlSugarClient.cs
+++ b/Src/Asp.NetCore2/ClickHouseTest/Demo/Demo0_SqlSugarClient.cs
@@ -107,7 +107,7 @@ namespace OrmTest
             var data6 = orderDb.GetPageList(it => it.Name == "xx", p, it => it.Name, OrderByType.Asc);
             Console.Write(p.TotalCount);
             List<IConditionalModel> conModels = new List<IConditionalModel>();
-            conModels.Add(new ConditionalModel() { FieldName = "id", ConditionalType = ConditionalType.Equal, FieldValue = "1", FieldValueConvertFunc=it=>Convert.ToInt32(it) });//id=1
+            conModels.Add(new ConditionalModel() { FieldName = "Id", ConditionalType = ConditionalType.Equal, FieldValue = "1", FieldValueConvertFunc=it=>Convert.ToInt32(it) });//id=1
             var data7 = orderDb.GetPageList(conModels, p, it => it.Name, OrderByType.Asc);
             orderDb.AsQueryable().Where(x => x.Id == 1).ToList();
 
diff --git a/Src/Asp.NetCore2/ClickHouseTest/Demo/Demo1_Queryable.cs b/Src/Asp.NetCore2/ClickHouseTest/Demo/Demo1_Queryable.cs
index 8987fce24..b58875c5c 100644
--- a/Src/Asp.NetCore2/ClickHouseTest/Demo/Demo1_Queryable.cs
+++ b/Src/Asp.NetCore2/ClickHouseTest/Demo/Demo1_Queryable.cs
@@ -58,7 +58,7 @@ namespace OrmTest
 
             var json = db.Queryable<Order>().ToJson();
 
-            List<int> listInt = db.Queryable<Order>().Select(it => it.Id).ToList();
+            List<long> listInt = db.Queryable<Order>().Select(it => it.Id).ToList();
 
             var dynamic = db.Queryable<Order>().Select<dynamic>().ToList();
 
diff --git a/Src/Asp.NetCore2/ClickHouseTest/Models/Custom.cs b/Src/Asp.NetCore2/ClickHouseTest/Models/Custom.cs
index 3b8871c57..0bc71a7c9 100644
--- a/Src/Asp.NetCore2/ClickHouseTest/Models/Custom.cs
+++ b/Src/Asp.NetCore2/ClickHouseTest/Models/Custom.cs
@@ -8,7 +8,8 @@ namespace OrmTest
 {
     public class Custom
     {
-        public int Id { get; set; }
+        
+        public long Id { get; set; }
         public string Name { get; set; }
     }
 }
diff --git a/Src/Asp.NetCore2/ClickHouseTest/Models/Order.cs b/Src/Asp.NetCore2/ClickHouseTest/Models/Order.cs
index d7ff068b8..871620098 100644
--- a/Src/Asp.NetCore2/ClickHouseTest/Models/Order.cs
+++ b/Src/Asp.NetCore2/ClickHouseTest/Models/Order.cs
@@ -9,15 +9,15 @@ namespace OrmTest
 
     public class Order
     {
-        [SugarColumn(IsPrimaryKey = true, IsIdentity = true)]
-        public int Id { get; set; }
+        [SugarColumn(IsPrimaryKey = true)]
+        public long Id { get; set; }
 
         public string Name { get; set; }
         public decimal Price { get; set; }
         [SugarColumn(IsNullable = true)]
         public DateTime CreateTime { get; set; }
         [SugarColumn(IsNullable =true)]
-        public int CustomId { get; set; }
+        public long CustomId { get; set; }
         [SugarColumn(IsIgnore = true)]
         public List<OrderItem> Items { get; set; }
     }
diff --git a/Src/Asp.NetCore2/ClickHouseTest/Models/OrderItem.cs b/Src/Asp.NetCore2/ClickHouseTest/Models/OrderItem.cs
index ae3262c7c..052e13bf5 100644
--- a/Src/Asp.NetCore2/ClickHouseTest/Models/OrderItem.cs
+++ b/Src/Asp.NetCore2/ClickHouseTest/Models/OrderItem.cs
@@ -8,9 +8,9 @@ namespace OrmTest
     [SqlSugar.SugarTable("OrderDetail")]
     public class OrderItem
     {
-        [SqlSugar.SugarColumn(IsPrimaryKey =true, IsIdentity =true)]
-        public int ItemId { get; set; }
-        public int OrderId { get; set; }
+        [SqlSugar.SugarColumn(IsPrimaryKey =true)]
+        public long ItemId { get; set; }
+        public long OrderId { get; set; }
         public decimal? Price { get; set; }
         [SqlSugar.SugarColumn(IsNullable = true)]
         public DateTime? CreateTime { get; set; }
diff --git a/Src/Asp.NetCore2/SqlSugar.ClickHouseCore/ClickHouse/DbBind/ClickHouseDbBind.cs b/Src/Asp.NetCore2/SqlSugar.ClickHouseCore/ClickHouse/DbBind/ClickHouseDbBind.cs
index 85164d688..f4c76747e 100644
--- a/Src/Asp.NetCore2/SqlSugar.ClickHouseCore/ClickHouse/DbBind/ClickHouseDbBind.cs
+++ b/Src/Asp.NetCore2/SqlSugar.ClickHouseCore/ClickHouse/DbBind/ClickHouseDbBind.cs
@@ -86,6 +86,7 @@ namespace SqlSugar.ClickHouse
                     new KeyValuePair<string, CSharpDataType>("Datetime64",CSharpDataType.DateTime),
                     new KeyValuePair<string, CSharpDataType>("Float64",CSharpDataType.@double),
                     new KeyValuePair<string, CSharpDataType>("Float32",CSharpDataType.@float),
+                    new KeyValuePair<string, CSharpDataType>("nullable",CSharpDataType.@object),
                 };
         public override List<string> StringThrow
         {
diff --git a/Src/Asp.NetCore2/SqlSugar.ClickHouseCore/ClickHouse/DbMaintenance/ClickHouseDbMaintenance.cs b/Src/Asp.NetCore2/SqlSugar.ClickHouseCore/ClickHouse/DbMaintenance/ClickHouseDbMaintenance.cs
index e8e336bc8..c505d0c8b 100644
--- a/Src/Asp.NetCore2/SqlSugar.ClickHouseCore/ClickHouse/DbMaintenance/ClickHouseDbMaintenance.cs
+++ b/Src/Asp.NetCore2/SqlSugar.ClickHouseCore/ClickHouse/DbMaintenance/ClickHouseDbMaintenance.cs
@@ -60,7 +60,7 @@ namespace SqlSugar.ClickHouse
         {
             get
             {
-                return "ALTER TABLE {0} ADD PRIMARY KEY({2}) /*{1}*/";
+                return "";
             }
         }
         protected override string AddColumnToTableSql
@@ -220,6 +220,10 @@ namespace SqlSugar.ClickHouse
         #endregion
 
         #region Methods
+        public override bool AddPrimaryKey(string tableName, string columnName)
+        {
+            return true;
+        }
         public override bool AddDefaultValue(string tableName, string columnName, string defaultValue)
         {
             return base.AddDefaultValue(this.SqlBuilder.GetTranslationTableName(tableName), this.SqlBuilder.GetTranslationTableName(columnName), defaultValue);
@@ -324,6 +328,7 @@ namespace SqlSugar.ClickHouse
             List<string> columnArray = new List<string>();
             Check.Exception(columns.IsNullOrEmpty(), "No columns found ");
             var pkName = "";
+            var isLower = ((ClickHouseBuilder)this.SqlBuilder).isAutoToLower;
             foreach (var item in columns)
             {
                 string columnName = item.DbColumnName;
@@ -339,14 +344,14 @@ namespace SqlSugar.ClickHouse
                 }
                 string nullType = item.IsNullable ? this.CreateTableNull : CreateTableNotNull;
                 string primaryKey = "";
-                string addItem = string.Format(this.CreateTableColumn, this.SqlBuilder.GetTranslationColumnName(columnName.ToLower()), dataType, dataSize, nullType, primaryKey, "");
+                string addItem = string.Format(this.CreateTableColumn, this.SqlBuilder.GetTranslationColumnName(columnName.ToLower(isLower)), dataType, dataSize, nullType, primaryKey, "");
                 columnArray.Add(addItem);
                 if (pkName.IsNullOrEmpty()&&item.IsPrimarykey) 
                 {
                     pkName = item.DbColumnName;
                 }
             }
-            string tableString = string.Format(this.CreateTableSql, this.SqlBuilder.GetTranslationTableName(tableName.ToLower()), string.Join(",\r\n", columnArray));
+            string tableString = string.Format(this.CreateTableSql, this.SqlBuilder.GetTranslationTableName(tableName.ToLower(isLower)), string.Join(",\r\n", columnArray));
             if (pkName.HasValue())
             {
                 pkName = this.SqlBuilder.GetTranslationColumnName(pkName);
diff --git a/Src/Asp.NetCore2/SqlSugar.ClickHouseCore/ClickHouse/SqlBuilder/ClickHouseExpressionContext.cs b/Src/Asp.NetCore2/SqlSugar.ClickHouseCore/ClickHouse/SqlBuilder/ClickHouseExpressionContext.cs
index 8b3694f60..9dfb8499b 100644
--- a/Src/Asp.NetCore2/SqlSugar.ClickHouseCore/ClickHouse/SqlBuilder/ClickHouseExpressionContext.cs
+++ b/Src/Asp.NetCore2/SqlSugar.ClickHouseCore/ClickHouse/SqlBuilder/ClickHouseExpressionContext.cs
@@ -4,7 +4,7 @@ namespace SqlSugar.ClickHouse
 {
     public class ClickHouseExpressionContext : ExpressionContext, ILambdaExpressions
     {
-        public SqlSugarProvider Context { get; set; }
+        public SqlSugarProvider Context { get; set; } = new SqlSugarProvider(new ConnectionConfig() { });
         public ClickHouseExpressionContext()
         {
             base.DbMehtods = new ClickHouseMethod();
@@ -31,7 +31,7 @@ namespace SqlSugar.ClickHouse
         {
             get
             {
-                return base.PgSqlIsAutoToLower;
+                return false;
             }
         }
         public override string GetTranslationTableName(string entityName, bool isMapping = true)
diff --git a/Src/Asp.NetCore2/SqlSugar.ClickHouseCore/Tools/UtilExtensions.cs b/Src/Asp.NetCore2/SqlSugar.ClickHouseCore/Tools/UtilExtensions.cs
index e7083f526..b4be13408 100644
--- a/Src/Asp.NetCore2/SqlSugar.ClickHouseCore/Tools/UtilExtensions.cs
+++ b/Src/Asp.NetCore2/SqlSugar.ClickHouseCore/Tools/UtilExtensions.cs
@@ -11,7 +11,11 @@ namespace SqlSugar.ClickHouse
     {
         public static string ToLower(this string value, bool isLower) 
         {
-            return value.ObjToString().ToLower();
+            if (isLower) 
+            {
+                return value.ObjToString().ToLower();
+            }
+            return value.ObjToString();
         }
         public static int ObjToInt(this object thisValue)
         {