The Sanjiangyuan area is located in the west of China, with an average altitude of 3500--4800 meters. It is the hinterland of the Qinghai-Tibet Plateau and the southern Qinghai Province of the world's roof. It is a world famous river with a long civilization history of the Chinese nation and the Central and Southern Peninsula: the source of the Yangtze River, Yellow River and Lancang River.