Introduction to Xiaofangpan City: Located in the Gobi Desert 90 kilometers northwest of Dunhuang City, the city is square in shape, with a loess barrier that is 10 meters high, 3 meters wide at the top and 5 meters wide at the bottom. The city wall is well preserved and is 24 meters long from east to west. , 26.4 meters wide from north to south, covering an area of ​​633 square meters, with one door in the northwest.