Abstract
Critical Discourse Analysis(CDA)is also caled critical language study, it is a new method of analyzing discourse dating back to 1980s and it originates from critical linguistics. The linguists who made great contributions to this subject are N.Fairclough,R.Fowler,Wodak,van Dijk and Kress. As a perspective of analyzing discourse,CDA has gained more and more attention from both home and abroad.