First of all, I would like to emphasize that the scenery of Cass Hell Valley is not as beautiful as that of online legends, or even worse than that of Aden. If it's just for the beautiful scenery, I don't think I need to expect much. From Cass Hell Valley to Aden in Daocheng, it is more a kind of feeling, removing the feeling that it is difficult to enter heaven from hell. Secondly, the usual route from Kas Hell Valley to Aden is to start from the Aden scenic spot, go downhill to Kas, and then charter a car to leave. This kind of walking usually takes 1-2 days. Starting from Chonggu Temple, which is more than 4000 meters above sea level, after passing through Pearl Sea, it enters the jungle and goes up all the way. After crossing the ghost gate, which is 4800 meters above sea level, it goes down and looks for the right side of the road. If you walk along the left side of the mountain, it leads to the Milky Sea. There will be at least two forks on the way down to Cass Village, which is less than 3,000 meters above sea level. In addition, you will see some crude stone houses on the way, you can choose to spend the night in them. In addition to this scheme, another more difficult one is to charter a car to Cass Village and then start hiking up the hill. The route is quite the opposite. Because of the need to climb from a low altitude of less than 3000 meters to a ghost gate of nearly 4800 meters, the physical strength of the former scheme is much greater, and few people try it. In either case, it is important to ask the guide and also suggest hiring mule camels to equip them with adequate food and water. If you want to stay overnight, bring cold protection equipment. As for mountaineering rods and other equipment, try to bring them with you. I belong to the type of excellent physical fitness, take the second route, used less than 6 hours to reload hiking.