How to identify and educate the "underachievers" is a serious problem refering to whether the quality-oriented education and the education for all people can be effectively carried out. In fact, the "underachievers" is a phenomenon not essence. If we can find out their interests and shining points, confirm them timely and guide them properly, they will realize their own self-worth and get confident so that the phenomenon will disappear. This article based on a underachiever's psychological characteristics and analysed the reasons caused to further discuss how to improve the "underachievers".