Abstract
This paper endeavors to analyze the main speech acts in Obama’s armistice speech on Iraq War and how the political speeches apply the speech acts to express the political intention of the speech. Under the framework of the Austin and Searle’s Speech Act Theory, the analyses place much more emphasis on the illocutionary acts of the specific speech acts. Furthermore, Van Dijk’s Macro-speech Act Theory are presented  to explore the relationships of these speech acts and discuss how the various subsidiary speech acts, taken as a “whole”, to support the main speech acts and to clear the intention of the speech and even the politics and standpoint of Obama. As there is limited research on macro speech acts of political speeches, this study carves out a new way on the study of political speeches. 
Keywords   Speech Act Theory    macro-speech act   political speech

本文主要探讨奥巴马对伊停战演说所实施的主要言语行为以及政治演说如何通过言语行为实现其演说意图。在奥斯汀和赛尔的言语行为理论框架下，本文通过对大量语料的定性剖析，揭示该演说如何表达其言外之力。同时，通过van Dijk的宏观言语行为理论，本人对该演说中各种言语行为的内在联系及主次言语行为在总体语篇框架中的作用进行了分析，进一步明确了政治演说如何运用不同的言语行为来表明其政见及立场。由于目前对政治演说宏观言语行为的研究仍很有限，本文为政治语篇的研究提供了新的视角。
关键词  言语行为理论   宏观言语行为   政治演说

Political discourse analysis is a field of discourse analysis which focuses on discourse in political forms (such as debates, speeches, and hearings) as the phenomenon of interest. As one of the important political discourse genre, political speech is often intentionally used by politicians to obtain the acceptance and support from the public.