the cause of the epidemic. According to the inquiry of Chengdu Epidemic Prevention and Control Center, as of December 1th, 222, 225 cases have been diagnosed, which are in high-risk areas, and the closure of Vanke Diamond Plaza in this area is the cause of the epidemic. Chengdu, referred to as "Rong" for short, is also called Rongcheng and Jincheng. Located in the middle of Sichuan Province, Chengdu is the capital and sub-provincial city of Sichuan Province, and one of the first national historical and cultural cities in China.