the traffic is low. Dali Bai Autonomous Prefecture, with its capital in Dali City, is located in the west of central Yunnan Province, and Old Town of Lijiang is located in the ancient city of Lijiang City, Yunnan Province, also known as Dayan Town. Due to the epidemic situation in recent years, few people travel. Dali and Lijiang, as tourist areas, have less people flow under such a general trend, and naturally there is no spread of the epidemic. Kunming, as a megacity in Yunnan, has a large population flow, and the circulation of people everywhere is also large, so there is an epidemic.