Xi jiaotong university juvenile class refers to students with excellent academic performance and strong scientific research potential in high school. They can enter the middle school affiliated to Xi Jiaotong University through a series of selection examinations, and the third year of high school directly enters the undergraduate stage of Xi Jiaotong University, which is the so-called "middle school undergraduate and postgraduate classes".

This selection method aims to provide a better learning and growth environment for outstanding high school students and cultivate future scientific and technological innovation talents. At the same time, students in junior classes also need to bear higher learning pressure and responsibility, and need to complete the learning tasks in senior high school undergraduate stage.