With the deepening reform of college English teaching in China, many self-access centers(SAC) have been established in universities to promote students' antonomy and cultivate their leanring ability. Based on the theories of constructivism, humanistic psychology and cognitive psychology, the self-access language learning ( SALL), with its new emphasis on speaking and llistening, is a very good supplement to traditional classroom teaching, whose focus is only on reading and writing. This paper intends to probe into the effectiveness of students' SALL in SAC of Wuhan Polytechnic Universtiy throu...