一.引言著名的应用语言学家克拉申从二十世纪七十初就开始研究第二语言习得,经过数十年的探索,克拉申通过对第二语言习得过程的分析,系统地阐述了他的外语教学思想和体系,丰富了第二语言习得理论,促进了第二语言研究领域的理论建设,并为第二语言教学提供了重要的启示,但该理论的许多不妥 I. Introduction The famous applied linguist Krashen began to study the second language acquisition from the beginning of the seventies of the 20th century. After decades of exploration, Krashen elaborated systematically through the process of acquiring second language His foreign language teaching ideas and system enriched the second language acquisition theory, promoted the theoretical construction in the second language research field and provided important enlightenment for the second language teaching, but many of the theories are not proper