Preventing and controlling the epidemic situation in COVID-19 is a very important issue. In terms of prevention and control, we should not only formulate perfect plans, but also take practical actions to better control the spread and outbreak of the epidemic, especially in many areas where very serious epidemics have occurred. The infected people in COVID-19 are all infected by mutant strains, so the emergence of so many patients has brought great pressure to the epidemic prevention and control, not only to better solve the daily life problems, but also to ensure the normal life of more healthy people. There are many infected people in this round of epidemic in Tianjin, the most important ones are detained students and families, especially the first batch of new cases are primary school students and some people in detention institutions. It can be clearly understood that these people are the first infected people in the infection chain. Although the specific source has not been found out, it can be clearly understood that the first batch of infected people are some students and custodians, so the epidemic situation in Tianjin can be said to spread very quickly, because the virus infected this time belongs to the variant Omicron's disease, and the virus infection has the characteristics of rapidity, and it may spread to the first generation in two to three days. According to the detection of nucleic acid, Omicron has many mutation points, and it has strong spreading power and infectivity. Therefore, the epidemic in Tianjin has the characteristics of fast spread, many infected people and short incubation period. The symptoms of infected people are not particularly obvious and concealed, but they are particularly prone to concentrated outbreaks. The reason why these people broke out in concentration is that his symptoms are not particularly obvious. Many people may think that these special symptoms are just general symptoms, not infected by viruses, so there are many people infected by viruses, and students account for a very large proportion of this infection. Although experts have not yet proved that children are the main population infected by this virus, at this time, the most epidemic occurred in cram schools and schools in Tianjin.