Open education is aimed at closed education. It is a student-centered learning method that encourages students to participate in learning activities. Openness is embodied in: open space, open environment, open curriculum, open attitude and open resource utilization. Closed teaching is a kind of teaching activity that limits teaching activities in a certain area and concentrates students' diet, accommodation and extracurricular activities on the same campus. Most boarding primary and secondary schools in China adopt closed teaching, some private schools also adopt closed teaching, and most military schools all adopt closed teaching.