Atom City is located in Jinyintan grassland, Haitang County, Haibei Tibetan Autonomous Prefecture, Qinghai Province, with a total area of more than 1,100 square kilometers. It is the first nuclear weapons development base built in China. The older generation of scientific and technological workers successfully developed China's first atomic bomb and first hydrogen bomb. The atomic city was built in 1958, and the first atomic bomb and the first hydrogen bomb were born here, so it is called the "atomic city".