Abstract:
Critical Discourse Analysis is a common analysis framework to analyze political discourse which includes public speaking. Its main purpose is to reveal the use of language, the relationship between ideology and power. It makes it clear that why speeches could win people’s support while using various discourse strategies. From transitivity, modality, personal pronouns and other aspects, this paper tries to analyze Critical Discourse Analysis on Obama's political speeches. We can find that how languages serve for ideology, and know more about the political purpose of the speaker.
Key Words   Critical Discourse Analysis    transitivity    modality  
personal pronouns

批评性话语分析是一种常见的分析框架，它的主要目的是解释语言的使用、意识形态和权力之间的关系。本论文将以奥巴马的政治演讲为语料，从各个方面及角度对其进行批评性话语分析，揭示其演讲极富感染力和煽动性的主要原因，以此达到更好识别和运用语用学的批判性话语的目的。同时通过分析奥巴马的几篇重要的演讲，总结前人对其的分析与评价，对奥巴马演讲的文体性研究及批评性话语分析奥巴马演讲为什么能起到如此好的效果。本文以前人对奥巴马演讲的及物性分析、情态分析、人称代词分析、语篇分析等多种分析手段为出发点，总结和阐述奥巴马演讲的精华之处。并创造性的分析奥巴马演讲对于公众情感的把握，既奥巴马演讲的重要魅力之一。同时，通过对不同文体的批评性话语的分类和效果综述来分析奥巴马不同文体演讲的所达到的预期效果的异同。
关键词： 批评性话语分析  文体性研究  及物性分析  情态分析
人称代词分析 语篇分析
      
When we talk about speech, it simply means that someone or some organization wants to publish their own views and opinions in order to clarify things or expressing emotion, in a language communication activity of propaganda to solve a specific problem with sound language as the main means, with body language as auxiliary methods in public places.
President mostly occupies a special place in American history; their speeches also have their own features. For more than two hundred years, from George Washington to Barack Obama, the Presidents show their hope and hero dream through their special kinds of speeches. So many political speeches not only represent presidents’ personal loyalty and enthusiasm but also become the vivid reflection of the grace and wisdom. It draws up a nation's social and historical, economic and cultural magnificent picture; therefore it is necessary to study American Presidents’ political speeches. This paper intends to shed light on the ideology in President Obama’s political speeches under the framework of critical discourse analysis.