Yanjing Town, Mangkang County, Tibet, is located on both sides of the Lancang River, at an altitude of 2,300 meters. It is the only place in China to maintain the complete and most primitive manual salt drying method. It has a history of 1300 years. The salt well has a long history of salt drying, and it is said that there has been a history of salt drying since the King Gesar period. King Gesar and Naxi have a war over salt wells. According to historical evidence, there is a history of salt wells drying salt from before the Tang Dynasty. To look up from the history of the world salt industry, there is no salt well-style salting method, it is unique in the world.