1, the number of students is too large. At the same time, the school has certain responsibilities and obligations to be responsible for the personal safety of students, and it is mandatory to live in collective dormitories, which is convenient for the unified management of the school. There are 20,000-30,000 students in an ordinary university, which leads the school to find ways to lock students in a certain area and implement effective management. 2, personal safety tens of thousands of students, from all corners of the country, are mixed. For example, once they leave the campus, local students can also be said to be the main responsibility for improper management at home. If they are foreign students, the school is arguing endlessly and is hard to blame. Harmful crimes mostly occur at night, so the school dormitory has a series of punishment systems such as access control system and sleep check system. Try to lock students in the dormitory at night. This is why universities require students to live on campus.