With the globalization of the world, language teaching becomes more important than ever before, and many universities and classroom teachers are active to explore the most efficient and effective methodology to teach languages to achieve a desirable result. When they seek to improve the quality of language teaching, they ofter research teaching methodologies by referring to general theories about language and language learning. Theoretical bases and teachers' hands-out experience have informed methodologies of language teaching, and methods of language teaching have been improved with the developments about linguistics, psychology and education. But there is a question which extent the information that theory has made available can be used to explore language teaching methodology and of the relevance of theory to language teaching methodology.
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