以批评性话语分析理论为基础,以美国12岁少女伊阿娜.怀克斯勒在民主党全国代表大会上的演说为语料,从语篇的及物性、情态和人称代词三个方面进行分析,结果表明语言是为意识形态服务的,语篇中的及物性过程、情态和人称代词的选择是演说者的语言使用技巧和政治意图的强有力表现。 Based on the theory of critical discourse analysis and the speech of the 12-year-old girl Iaina Wackler in the Democratic National Convention as the corpus, this article analyzes three aspects of the discourse, such as materiality, modality and personal pronouns, The result shows that language serves ideology. The selection of material processes, modalities and personal pronouns in discourse is a powerful manifestation of the speaker’s language use skills and political intention.