Some knowledge of linguistics will not only help language teachers to better understand the nature of language, but also helps them better understand how to teach language. Theoretical views of language explicitly or implicitly inform the approaches and methods adopted in language teaching. Language teachers do need a theory or some theories of language in order to teach language effectively, and they need to know at least how the language they teach works. To discover the real language and to obtain some understanding of it, language teachers may well turn to linguistics. Many language learning theories are proposed based on certain linguistic theories. In fact,knowledge in linguistics lies at the root of understanding what language learners can learn, how they actually learn and what they learn ultimately. Therefore, linguistics has always played an important role in the studies of language acquisition and learning.

首先总体阐述语言学相关知识对语言教师的重要性， 然后分别从语言学中关于语言的理论， 语言习得理论以及语言教学理论等方面具体分析语言学知识对语言教学的重要意义。