In view of problems prevalent in English teaching and learning,the author advocates a new approach to improving the present situation.The article discusses the feasibilities of lexical chunks in English learning theoretically and then expounds the experiment of lexical chunks in the public speaking course,including how to raise the awareness of lexical chunks in the subjects and how to reinforce the in-put and out-put of English so as to improve the learning efficiency.The paper also reports the experiment and proves the effect of lexical chunks on English learning by the subjects' experience and examination results.Some implications are given based on the findings.