The source of the three rivers is the hinterland of the Qinghai Tibet Plateau, the roof of the world, and also the source catchment area of the Yangtze River, the Yellow River and the Lancang River, which gave birth to the Chinese nation and the long civilization history of the Indochina Peninsula. It is of irreplaceable significance to the Hexi Corridor, Qinghai Tibet Plateau, Mongolian Plateau, Mongolian Plateau and loess plateau that have affected China for thousands of years. This book sorts out and explores deeply from the perspective of history, geography and humanities. The author has made an in-depth observation on the pastoral area, rivers and natural environment of source of the three rivers, leading readers to rush to the cliff wilderness and pick up the lost civilization. At the same time, the micro presentation of the historical memory, life history and scenery of the Han and Tibetan Nationalities complement each other with the vast knowledge field and cultural geographical space of the three rivers.