An effective formative assessment system is indispensable to the current reform of college English teaching which emphasizes the importance of the MCALL(Multimedia Computer Assisted Language Learning).Terminal asses- mentcoupled with formative Assessment makes up the complete assessment system.The study shows that the introduced assessment system not only stimulates leamers motivation and interest to learn,but also makes it possible to monitor and facilitate learners'learning process as well as their autonomy.More noticeably observed is the successfully cultivation of learner autonomy,cooperative learning and communicative skills.