BYD's promotion is very slow. It takes three months to be fast and at least half a year to be slow. It is divided into nine major levels, and each major level is divided into three minor levels.

General freshmen and undergraduate freshmen who failed in CET-4 were rated as G 1 and Di Xin 1500. Students who have passed CET-4 are designated as F 1, with a basic salary of 2,500. The reason why some G3 wages are higher than F 1 is that there is only a minimum wage at each level, and there is no maximum wage, so this may happen. But promotion will definitely not reduce salary.