diff --git a/SqlServerTest/Demos/5_CodeFirst.cs b/SqlServerTest/Demos/5_CodeFirst.cs
index e5f76fb0f..eecdbee2e 100644
--- a/SqlServerTest/Demos/5_CodeFirst.cs
+++ b/SqlServerTest/Demos/5_CodeFirst.cs
@@ -11,8 +11,8 @@ namespace OrmTest.Demo
      
         [SugarColumn(IsNullable =false ,IsPrimaryKey =true,IsIdentity =true)]
         public int Id { get; set; }
-        [SugarColumn(Length = 21)]
-        public string Name { get; set; }
+        [SugarColumn(Length = 21,OldColumnName = "Name2")]
+        public string Name{ get; set; }
         [SugarColumn(IsNullable = true)]
         public bool IsOk { get; set; }
         public Guid Guid { get; set; }
diff --git a/SqlSugar/Abstract/CodeFirstProvider/CodeFirstProvider.cs b/SqlSugar/Abstract/CodeFirstProvider/CodeFirstProvider.cs
index 258c0ed83..af2bfee28 100644
--- a/SqlSugar/Abstract/CodeFirstProvider/CodeFirstProvider.cs
+++ b/SqlSugar/Abstract/CodeFirstProvider/CodeFirstProvider.cs
@@ -70,6 +70,7 @@ namespace SqlSugar
         private void NoExistLogic(EntityInfo entityInfo)
         {
             var tableName = GetTableName(entityInfo);
+            Check.Exception(entityInfo.Columns.Where(it => it.IsPrimarykey).Count() > 1, "Use Code First ,The primary key must not exceed 1");
             List<DbColumnInfo> columns = new List<DbColumnInfo>();
             if (entityInfo.Columns.IsValuable())
             {
@@ -80,6 +81,11 @@ namespace SqlSugar
                 }
             }
             this.Context.DbMaintenance.CreateTable(tableName, columns);
+            var pkColumns= entityInfo.Columns.Where(it => it.IsPrimarykey).ToList();
+            foreach (var item in pkColumns)
+            {
+                this.Context.DbMaintenance.AddPrimaryKey(tableName, item.DbColumnName);
+            }
         }
         private void ExistLogic(EntityInfo entityInfo)
         {
@@ -133,6 +139,7 @@ namespace SqlSugar
                 foreach (var item in entityColumns)
                 {
                     var dbColumn = dbColumns.FirstOrDefault(dc => dc.DbColumnName.Equals(item.DbColumnName, StringComparison.CurrentCultureIgnoreCase));
+                    if (dbColumn == null) continue;
                     var pkDiff = item.IsPrimarykey != dbColumn.IsPrimarykey;
                     var idEntityDiff = item.IsIdentity != dbColumn.IsIdentity;
                     if (dbColumn != null && pkDiff && !idEntityDiff)
diff --git a/SqlSugar/Abstract/DbMaintenanceProvider/Methods.cs b/SqlSugar/Abstract/DbMaintenanceProvider/Methods.cs
index 7f6d43d9a..bc1d2142b 100644
--- a/SqlSugar/Abstract/DbMaintenanceProvider/Methods.cs
+++ b/SqlSugar/Abstract/DbMaintenanceProvider/Methods.cs
@@ -180,7 +180,7 @@ namespace SqlSugar
                 string dataType = item.DataType;
                 string dataSize = item.Length > 0 ? string.Format("({0})", item.Length) : null;
                 string nullType = item.IsNullable ? this.CreateTableNull : CreateTableNotNull;
-                string primaryKey = item.IsPrimarykey ? this.CreateTablePirmaryKey : null;
+                string primaryKey = null;
                 string identity = item.IsIdentity ? this.CreateTableIdentity : null;
                 string addItem = string.Format(this.CreateTableColumn, columnName, dataType, dataSize, nullType, primaryKey, identity);
                 columnArray.Add(addItem);