diff --git a/Src/Asp.Net/SqlSugar/Abstract/EntityMaintenance/EntityMaintenance.cs b/Src/Asp.Net/SqlSugar/Abstract/EntityMaintenance/EntityMaintenance.cs
index 4eddc2a62..20e89726a 100644
--- a/Src/Asp.Net/SqlSugar/Abstract/EntityMaintenance/EntityMaintenance.cs
+++ b/Src/Asp.Net/SqlSugar/Abstract/EntityMaintenance/EntityMaintenance.cs
@@ -1,4 +1,5 @@
-using System;
+using SqlSugar.DbConvert;
+using System;
 using System.Collections.Generic;
 using System.IO;
 using System.Linq;
@@ -317,7 +318,7 @@ namespace SqlSugar
                             {
                                 column.DataType = "json";
                             }
-                            else if (column.Length > 0) 
+                            else if (column.Length > 0)
                             {
                                 column.DataType = "varchar";
                             }
@@ -326,6 +327,14 @@ namespace SqlSugar
                                 column.DataType = "varchar(4000)";
                             }
                         }
+                        else if (typeof(Nvarchar2PropertyConvert).Equals(sugarColumn.SqlParameterDbType)&&column.DataType==null) 
+                        {
+                            column.DataType = "nvarchar2";
+                            if (column.Length == 0) 
+                            {
+                                column.Length = 200;
+                            }
+                        }
                     }
                     else
                     {