Closed cell management is to draw a clear line between the interior and exterior of the cell, making a clear separation between internal and external personnel. Many places require closed management in each district, including closing unnecessary access routes, requiring people to wear masks in and out, closing crowded places in the district, and strictly verifying and registering people and vehicles coming and going. During the new crown pneumonia epidemic, the closed management style of the community is also seen in the use of access cards for owners to enter and exit, and strict checks on outsiders to enter and exit. Property disinfection of elevators, door handles, courier storage areas and other public areas more than 2 times a day. In addition, independent collection buckets for discarded masks should be set up in the district, and timely posting of warm tips in buildings where suspected or confirmed cases appear.