2021August 1 1, Chengdu, Sichuan began to close. 14 days later, on August 25th, the epidemic was officially lifted.

The time standard for unsealing the sealed controlled area and the controlled area is: 1, and there are no new cases or asymptomatic infected people in this area in the past 14 days. 2. The last close contact in this area was exposed for more than 14 days, and the nucleic acid test was negative. 3. All personnel in this area completed a round of nucleic acid screening two days before unsealing.