The ancient city of Xilai, the 1,700-year-old city, is the kind of place that is neglected in most tourist guides for foreign tourists and is probably not at the top of the list of must-sees for most visitors from Sichuan. We must preserve the charm of the old cities as much as possible and, at the same time, refresh the historic buildings. dassoXTR, the most appropriate product that has both the sense of historical relics and high quality, has been widely used in this project.