This thesis focuses on the importance of lexical approach in improving oral English competence of aviation English learners. According to Canale and Swain' theory of English communicative competence, which divides the communicative competence into four parts:grammatical competence, sociolinguistic competence, discourse competence and strategic competence. The author probes into the important role that lexical chunks play in developing communicative competence respectively.% 本文分析了词块教学在提高民航英语学习者口语交际能力方面的重要作用。根据卡纳尔和斯温对交际能力的划分，交际能力分为语法能力、社会语言能力、语篇能力和策略能力四个方面，分别讨论了词块教学对民航英语学习者在这四种能力方面的促进作用。
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