Li Heping Middle Street, Dongcheng District, Beijing. According to Baidu map, Beijing is located in the north of North China Plain, where there is a CDC named "Beijing Center for Disease Control and Prevention", located in Hepingli Middle Street, Dongcheng District, Beijing. The center is mainly responsible for environment and occupational health, nutrition and health, qualification certificate, elderly health, maternal and child health care, etc. Health knowledge training certificate needs to contact the local CDC for training and health certificate examination.