Boarding school is one of the places where people usually live in densely crowed conditions. In order to control the risk of COVID-19 epidemic in boarding schools

five levels of practicable pandemic prevention measures and their effects on infection risks in five typical campus living scenes

including going to washroom

going out

going to class

having meal

and returning to dormitory were proposed

and the susceptible-infective (SI) model based on statistics and probability hypotheses was developed. Then the SARS-CoV-2 infection rates among students in 14 days were simulated in two typical apartment types: four-person dormitory with two public washrooms on each floor (apartment A) and six-person dormitory with a private washroom (apartment B). Results show that for apartment A

once there was an infected person

the epidemic spread rapidly in the whole building even under the most stringent prevention and control measures (level V). While for apartment B

when the most stringent prevention and control measures (level V) were taken

the epidemic could be controlled within the range of less than 10 people in two weeks. In addition

full vaccination would significantly inhibit the infection rate

and the number of washrooms would no longer be a significant factor. Even if no prevention and control measures were taken

the number of infected people would decrease significantly

and the number of persons in one dormitory became the main factor affecting the spread of the virus. The research results can provide information support for campus epidemic prevention and control.