In the process of high schools rapid development in China,mega-schools which are set up on the basis of model high schools and high quality schools play an important role in enlarging secondary education scale and providing more high quality education resources to more students.

But in recent years, conflicts have been frequently occur between students behaviors and college regulations, so college regulations face unprecedented challenges.

Reducing school size is one of the new measures that the US takes to improve the quality of elementary education.

Decision of appropriate school size is limited by two elements: one is on the basis of education quality which lays emphasis on seeking student s ideal learning effect and results in development of body and mind; the other is on the basis of education efficiency which lays emphasis on pursuing ideal economic returns.