From Xi'an, through Baoji, Pingliang, Lanzhou, Huangnan, Xining, Golmud, Naqu to Lhasa, Tibet. Among them, Golmud to Naqu 800km, with an average altitude of 4600m, is a great challenge to people and cars. "Infinite scenery in the dangerous Peak" Qinghai-Tibet Line not only has beautiful scenery, cherished wild animals and plants. There are Tibetan art treasures thangka, embroidery, statues and so on. Travel time: April to November. Travel vehicles: Mercedes-Benz RV (self-driving, with team leaders, service personnel) Mercedes-Benz business (with drivers, team leaders, service personnel). Service personnel: foreign tourists; domestic team (including travel service agencies); Chinese individuals need to join the member club.