Data in Chinese health databases is from the China Ministry of Health, covering the medical and health statistics in the whole country and 31 provinces, autonomous regions and municipalities, as well as covering national statistics of historical important years, using to study the situation of Chinese health development and residents' health level. Database is divided into two sub-national and sub-regional libraries, including the number of health care institutions, the number of health personnel, the number of equipment spent more than million Yuan, visit and hospitalization, disease control and the residents' situation of sick or injury or death, medical security system or other key indicators. Data has been updated annually since 1949.