Recently, the local epidemic situation in China has shown a severe and complex trend of wide spread, multiple transmission chains and expanded epidemic coverage. The big exam is still going on. The harder it is, the more confidence and fighting spirit should be strengthened. The meeting stressed that we should unswervingly adhere to the principle of people first and life first, unswervingly implement the general strategy of "external defense against input and internal defense against rebound", and unswervingly implement the general policy of "dynamic reset". Over the past few days, all departments around the country have resolutely implemented the decisions and deployment of the Central Committee of the Communist Party of China, adhered to the ninth version of the prevention and control plan, implemented 20 measures to further optimize the prevention and control work, made efforts to optimize and refine the working methods, and strived to carry out the prevention and control work scientifically and accurately according to local conditions. Refine and speed up, curb the spread of the epidemic, COVID-19 continues to mutate, and the Omicron mutant has also evolved into a number of sub branches, with strong concealment and fast transmission speed. As an important part of epidemic prevention and control, the speed of "chasing the positive" and "finding the positive" is directly related to the efficiency of cutting off the virus transmission chain. "Hello, I'm a staff member of the flow survey team, and I want to check the relevant information with you." In an office in Kangmei Street, Liangjiang New Area, Chongqing, the flow dispatcher recorded the communication with residents, combined with big data comparison and field verification, and formed a flow survey report. In view of the characteristics of multi points and multi chains of the epidemic situation and the coexistence of distribution and aggregation, Chongqing has put into use the "lightning" quick screening system for chasing the sun. After receiving the mixed inspection number, the system automatically extracts the basic data of the positive mixed management personnel, tracks the key result nodes of the single pipe re inspection in real time, and effectively reduces the average duration of "chasing the positive" and "finding the positive". A plastic bag was hung at the entrance of many residents in a residential area of South China Street built in Yuhua District, Shijiazhuang, Hebei Province. The property management personnel wearing protective clothing put the antigen detection reagent into the plastic bag door to door, and the residents received the reagent and tested it by themselves. If there was any abnormality, they reported it to the community in time, and then the "Dabai" came to the house for single person single tube review. This reduces personal contact and the risk of cross infection. The faster the virus spreads, the faster it must be controlled; The more serious and complex the situation is, the more scientific and accurate prevention and control should be highlighted. Adjust risk areas to "high and low", correct unscientific practices such as "two inspections a day" and "three inspections a day", and emphasize the implementation of classified management in different risk areas, and code management during home isolation... The Joint Prevention and Control Mechanism Comprehensive Group of the State Council issued 20 optimization measures, and sent a working group to supervise and guide the local authorities to implement the 20 optimization measures. Shanghai optimized, adjusted, refined and implemented relevant prevention and control measures, and issued a series of requirements; Beijing has established a mixed management and sun chasing dispatching command mechanism to quickly detect individual samples taken by personnel involved in mixed management in accordance with the principle of proximity, convenience and quickness; Guangzhou Baiyun District dynamically adjusted the prevention and control measures, lifted the measures to restrict the flow of people in some streets where there were no new positive social infections for three consecutive days, and gradually restored the normal production and living order and production and operation... All regions continued to improve the level of differentiated and accurate prevention and control by regions and levels. On the afternoon of the 25th, the Sixth Affiliated Hospital of Sun Yat sen University held the second batch of support shelter medical teams to go on an expedition, injecting new strength into building a stronghold for epidemic prevention and control. Currently,