As for the location of Yumen Pass in the Han Dynasty, some ancient books from the Tang and Song Dynasties, such as "Kuo Di Zhi", "Yuanhe County Map", etc., all believe that the location of Yumen Pass in the Han Dynasty was in the northwest of Shouchang County in the Tang Dynasty59 km. Shouchang County in the Tang Dynasty was the site of the ancient city of Shouchang in Dunhuang South Lake.
The Dunhuang posthumous documents "Shazhou Illustrated Book", "Shazhou City Earth Mirror", "Shouchang County Landscape", etc. all believe that the site of Han Yumen Pass is 80 kilometers north of Shouchang County in the Tang Dynasty at.
It is also believed that the earliest Yumen Gate of the Han Dynasty was located in the east of Dunhuang, that is, Yumen County, which was later near Yumen Chijin. In 103 BC, the Han general Li Guang conquered Dayuan and then moved to the northwest of Dunhuang.
Later, based on the Han bamboo slips from the beacon fire sites in Maquanwan and other places in Dunhuang, as well as research on the local topography and the location of the post roads, people came to the conclusion that Yumen Pass should be located on the east side of Linyao Sui. On the west side of Menhou Guansui, it seems to be 6,000 meters southwest of the Maquanwan site, 11,000 meters west of Xiaofangpan City. The ancient post road leading to the Western Regions passes through the middle of this highland.