Mangkang Yanjing Ancient Salt Field has a history of 1300 years, located on the east and west sides of the Lancang River, Yanjing Town, Mangkang County, Tibet, is the only place in China to maintain the complete and most primitive hand-salted method. Yanjing belongs to Mangkang County, is the first stop of the "Tea Horse Ancient Road" in Tibet. The sea is about 3,000 meters away, close to the Lancang River, and the township is on both sides of the mountain with more than 4,000 meters. The brine on both sides of the river is rich and springs out of nature. People in the springs of stone solid water, forming a well salt, then back to the brine to the riverside low level, the same around the field, let the sun steam, after the water is exhausted is coarse salt, and then back the coarse salt back to the flat house items further drying. The general ancient legal salt is like this.