Novel coronavirus pneumonia has been reported in 1758 cases in Xi'an since December 9, 2021 to 24 at January 3, 2022. The local epidemic prevention and control has entered the "general attack" stage and is promoting the "social clearance". What is "social clearance"? What measures need to be taken? With these questions, the reporter of Xinhua news agency interviewed Chen Zhijun, deputy director of Xi'an Center for Disease Control and prevention. Q: what is "social clearance"? What effective measures need to be taken? A: "social clearance" means that all new confirmed cases found later are among isolated close contacts or close contacts of close contacts, and there is no community-based epidemic spread. The realization of "social clearance" is to create good conditions for the city to adjust prevention and control measures and gradually return to normal. Therefore, first of all, it is necessary to completely block community transmission. In the corresponding longest incubation period, no new confirmed cases are found in the community. After the realization of "social clearance", the closed management state of Xi'an is also expected to be gradually lifted. After sending the confirmed cases to medical institutions for treatment, we gather close contacts and corresponding secondary close contacts to a single room hotel for isolation medical observation, which is a necessary measure to ensure that the community eliminates all potential infectious sources. Q: what measures should be taken for the recent cluster epidemic in Xi'an? A: in the early stage, we found some concentrated epidemics. In some urban villages and communities with large population density, if the control is not strict, it is difficult to ensure that there is no contact between people. In high-rise buildings, the common use of elevators may lead to the spread of viruses. Therefore, during this period, in order to cut off the transmission route as soon as possible, we still transfer the close contact people to the isolated hotel. For individuals, early detection, early diagnosis and early treatment can be achieved; For families, communication among family members can be avoided; Communication within the community can also be effectively controlled. (outlook new era)