The altitude gap with Kangding City is 1800 meters, which is the first alpine port on the Sichuan-Tibet line that needs to be overturned, so it is called the "Kangba First Pass". Zeduoshan is both the watershed of Dadu River and Yaqi River basin, and the boundary of Han-Tibet culture. After crossing the Zeduoshan, it officially entered the Kangba Tibetan area.