When students do English reading, they often spend a lot of time identifying words, which reducing reading speed and affecting the understanding of the whole chapter. Lexical chunks, as a whole unit stored in human brain, which can reduce the time for brain processing information, can help automatically identify and extract, and can improve the fluency and accuracy of language expression. The theory of lexical chunks provides a new idea for English reading teaching. Based on functional

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... ation of lexical chunks, this paper analyzes the effect of lexical chunks on English learning and English reading teaching, and puts forward ways to improve English reading ability by using lexical chunks theory. The specific ways include: cultivate the consciousness of lexical chunks, the use of extracurricular resources to expand lexical chunks learning channels, in the context of reading to learn lexical chunks and use lexical chunks to analysis chapter structure. Introduction Reading, as an important way of language input, occupies an important position in English teaching. Improving students' English reading ability is not only the purpose of English learning, the means of learning English well, but also the way to test students' English knowledge, cultural knowledge, thinking ability, comprehensive ability to deal with information, and it is the only way for students to increase cultural knowledge, expand cultural vision, enhance literary accomplishment, improve self-learning ability. When students do English reading, they usually need to spend a lot of time identifying words, reducing reading speed, decentralizing the understanding and discourse processing capability, affecting the understanding of the whole chapter. At present, the popular English reading teaching mode and the psychological language reading mode emphasize the role of grammatical knowledge in the understanding of article. The bottom-up mode advocates the meaning of gradual construction from the word to the chapter, but the interactive mode emphasizes the diversification of information processing. These reading models can not get rid of relying on the grammar and words. Lexical chunks, which has relatively fixed structure, has meaning with more stable combination of words, covering phrase, fixed collocation and idioms, etc. As the whole processing stored in memory, the use of lexical chunks leaves out language computing resources and response time the grammar rules temporarily generated, which can help achieve different pragmatic functions. Lexical chunks can be stored as a whole unit in human brain, use it to reduce the time for brain dealing with information, help automatically identify and extract, and improve the fluency and accuracy of language expression. Due to the limited vocabulary and the negative transfer of native language, students often have a certain sense of fear in English expression, which is not conducive to English learning. Compared with the word, lexical chunks is easier to remember, lexical chunks learning and mastering can help students to expand vocabulary, increase language input, help accelerate the language output speed, improve language expressive ability. As an effective way of learning, lexical chunks learning strategy provides a new idea for foreign language teaching. This paper is based on the theory of lexical chunks to improve the ability of English reading ability, so as to improve the teaching level of English reading. Functional Classification on Lexical Chunks The function of lexical chunks is studied from different points and classified functions, of which the