ABSTRACT:Appraisal theory mainly explores how the writer expresses his subjective attitude. It includes the attitude of the contents and the potential attitude of readers. The theory, especially the core subsystem of the appraisal theory, attitude system has an important value for analyzing the political speech. It can help us to understand the position, opinion and attitude represented by addresser and his country. This paper attempts to analyze deeply the metalanguage of the speech on the way of attitude, reveals the metalingual function of attitude, analyzes Obama’s attitude to supply his purpose that he calls on youth to pay attention to education and tries to offer some suggestion for readers to digest the speech deeply.

Keywords: Attitude   Metalingual Function   Speeches

摘要:评价理论主要研究语篇中作者如何表达主观态度，包括作者对所讲内容的态度及其对于潜在读者的态度。该理论，特别是其子系统态度系统对分析广受人们关注的政治演说具有重要应用价值，它可以帮助我们了解演讲者乃至所代表的国家的立场、观点和态度。本文尝试从态度系统出发，揭示演讲语篇的元语言功能，从而分析奥巴马如何通过态度系统以达到呼吁青少年重视学习的目的，并试图为读者深层解读演讲提供一些建议。

关键词：态度    元语言功能     演讲

　　　Political speech is one of the important types of speeches that are paid attention to, by which we can understand the position, opinion and attitude represented by addresser and his country. Appraisal theory mainly explores how the writers express their subjective attitude. Thus the appraisal theory is often used for speech to express the attitude of the speaker. The attitude includes the attitude of the contents and the attitude of potential readers. Since a lot of people resolve the speech by one or two subsystems of appraisal theory, it is difficult to establish a complete system to analysis. As the core subsystem of the appraisal theory, attitude system focuses on the opinion of the writer. This paper attempts to analyze deeply the metalanguage of the speech on the way of attitude, reveals the metalingual function of attitude, analyzes Obama’s attitude to supply his purpose that he calls on youth to pay attention to education and tries to offer some suggestion for readers to digest the speech deeply.