The spine bending deformation is a serious problem for teenagers because of working longtime behind desk, which even affects their growth healthfully. So it is important to design a scientific, healthy, comfortable learning chair for the teenagers. Through analyzing and synthesizing students’ learning posture, physiological characteristics and psychological characteristics, this project obtains abundant data and creates a new-style chair by combining the theory of ergonomics to the chair that can adjust the position and shape of cushion and backrest to fit the posture of the user. By adjusting dynamically the physiological features of teenagers, it can help teenagers develop good learning habits and improve learning efficiency.