The academic system that is conducive to the gradual popularization of education is the B-track system. The single-track system represented by the United States was formed in the second half of the19th century. Specifically, it is the bottom-up structure: primary school, middle school, and then university.

"Track" refers to the number of classes in a grade. The phenomenon of single-track system and dual-track system in history is based on the social background and class division at that time. The dual-track system, mainly according to the class and social status of students, enters two different academic systems respectively.

The establishment of a system for the children of nobles and privileged classes is mainly to enable them to enter grammar or public schools with academic courses as the mainstay, and to be promoted to institutions of higher learning or universities in the future to master academic theoretical knowledge. The other system is set for ordinary people, that is, to cultivate the skills needed for daily production and life for ordinary people.

An important purpose of the dual-track system is to mediate the contradiction between "elite" and "popularization" of higher education and realize the principle of "equality while seeking differences", but it is actually an educational system with unequal educational opportunities.

We can illustrate this point with examples. Take Britain as an example: First of all, according to the principles of the British higher education system, universities maintain their traditional academic tasks, while the public higher education departments of ordinary people's schools must develop vocational higher education and related types of higher education.