Mianyang Nine Hospital is a highly confidential unit of the state. Mianyang nine hospitals are located in "Li Bai's birthplace, China's science and technology city" and known as the second largest city in Sichuan Province, Mianyang, full name of the China Academy of Engineering Physics (CAEP), also known as the City of Science, the Institute of Materials, or 839, is located in the city of Mianyang, Sichuan Province, Mianyang, the nine hospitals are the state plan of China's only nuclear weapons development and production units, is to develop cutting-edge science and technology for national defense, a set of theory, design, design, and production of nuclear weapons. Development and production units, is to develop cutting-edge science and technology for national defense as the main set of theory, experimentation, design, production as one of the integrated research institute, the subordinate schools have Science City, a middle school.
Basic change
Nine hospitals in Beijing in 1958, experienced three base changes: 1962 began to move from Beijing to Haiyan 221 plant in Qinghai nuclear weapons development base: in 1969 moved to Sichuan "nine hundred and twenty-two area: In 1990, it began to move to Mianyang Science City, the implementation of the relative concentration, the same year, the nine hospitals management system adjusted to the national plan for the relatively independent scientific research institutions. Nine hospitals name has been used in the Ministry of Second Machine nine Bureau, Beijing Ninth Research Institute, the Ministry of Second Machine Nine Research and Design Institute (in fact, from this began to be called the Ninth Institute), the People's Liberation Army Ninth Research Institute, the Ministry of Nuclear Industry, the Ninth Research Institute.