This video elaborates on the conservation value of Sanjiangyuan National Park as an important ecological security barrier and highland biological germplasm resource bank in China, which is of great significance to the whole country and even the world. Through ten parts, including Yangtze River Source, Yellow River Source, Lancang River Source, Tanggula Mountain, Kunlun Mountain, Qilian Mountain and the water resources and ecological barrier function of the Three Rivers Source, the audience is led to appreciate the source of the three rivers and the Chinese water tower.