This paper aims to explore the motives of college students’attending the postgraduate entrance examination. The result shows that there are 6 factors which influence the motives. According to the degree from strong to weak they are self realization factors，knowledge ability factors，working pressure factors，living and studying factors, interest and hobby factors，and environment factor. The paper also investigates the difference between boys’and girls’motivations. In order to improve the post graduate exam work，this paper also studies the difficulties and the self-ajusting methods of the sutdents in their preparation process