Shimengou plank road is located at Shimenyukou, 200 meters northeast of Shimengou Village, Dachuan Town, Zhouqu County, Gannan Tibetan Autonomous Prefecture. The east and west sides of the cliff face each other at an altitude of 100 meters. From a distance, it looks like two huge stone gates standing between heaven and earth, which is very spectacular. On the cliffs on both sides, there are more than 80 plank road pile holes, and the distance between each hole is about 1.2m to 6m. To the east, about 1 m above the riverbed, there is an inscription 1 on the cliff, which records the visit to Guancheng by Yuan Wailang, the minister of Shangshu, and Zhu Churen, the judge of the state government, who set up farmland in October of the fourth year of the Northern Song Dynasty.
According to historical records, Dayu and Wuping in the southwest of Zhouqu County were named "Tuzhong" in the Han and Wei Dynasties, which is a strategic location on the west line of Longshu Road, and Shimengou Ancient Road is the only place leading to the ancient soil and even Sichuan. Since the Tang and Song Dynasties, it has gradually become an important section of the "Tea-Horse Ancient Road". Businessmen walking along this road are mostly mules, horses or shoulder-bearers, mainly trafficking in tea, medicinal materials and leather goods, and their transactions are very active. The discovery of this ancient site and the inscription in the fourth year of the Northern Song Dynasty provide new materials for the study of road traffic, ethnic relations, tea-horse trade, cultural exchanges and other topics in Gulongshu.