The first-level discipline is a major discipline category, equivalent to a major, and is represented by a four-digit code; The second discipline is a sub-discipline below it, which is equivalent to the direction. Generally, it is set by a qualified school and represented by a six-digit code.

Two disciplines can't apply for a first-class discipline, but it can apply for a master's and doctor's degree awarding point. Once the first-level discipline is successfully applied, the two disciplines under it can apply to become doctoral degree awarding points.

The first-level discipline consists of several two disciplines, for example, mathematics consists of five two disciplines, including basic mathematics and computational mathematics. Doctoral and master's degrees will be awarded to two disciplines. Generally speaking, the number of doctors and masters refers to the number of doctors and masters that can be awarded in two disciplines.