diff --git a/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/Realization/MySql/DbMaintenance/MySqlDbMaintenance.cs b/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/Realization/MySql/DbMaintenance/MySqlDbMaintenance.cs
index df858c0a9..45c55a8c7 100644
--- a/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/Realization/MySql/DbMaintenance/MySqlDbMaintenance.cs
+++ b/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/Realization/MySql/DbMaintenance/MySqlDbMaintenance.cs
@@ -383,7 +383,7 @@ namespace SqlSugar
                 }
                 else
                 {
-                    appendSql += column.IsNullable ? " NULL" : "NOT NULL";
+                    appendSql += column.IsNullable ? " NULL " : " NOT NULL ";
                 }
                 tableName = this.SqlBuilder.GetTranslationTableName(tableName);
                 oldColumnName = this.SqlBuilder.GetTranslationColumnName(oldColumnName);