Medical and health care career has developed rapidly since the founding of People's Republic of China,especially with the development of informatizaiton since 1980s.The paper divides the development process of national health informatization in China into four phases of the rise of medical institution informatization, the development of the information system of major businesses, interconnectivity and cooperative application, as well as comprehensive improvement and innovation development. It delivers the development features, policy trends, building results, providing outlook of the future development of national health informatization in the hope of serving as reference for the building of national health informatization in China.