Generally speaking, you need to go to the local health and epidemic prevention station to apply for a health certificate. Changzhou Lanling Health Certificate is handled in Changzhou Center for Disease Control and Prevention.
Changzhou is located in the south of the Yangtze River, on the shore of Taihu Lake, in the center of the Yangtze River Delta, across the sea from Shanghai and Nanjing, and forms Suzhou-Wuxi metropolitan area together.