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:評價理論主要研究語篇中作者如何表達主觀態度，包括作者對所講內容的態度及其對于潛在讀者的態度。該理論，特別是其子系統態度系統對分析廣受人們關注的政治演說具有重要應用價值，它可以幫助我們了解演講者乃至所代表的國家的立場、觀點和態度。本文嘗試從態度系統出發，揭示演講語篇的元語言功能，從而分析奧巴馬如何通過態度系統以達到呼吁青少年重視學習的目的，并試圖為讀者深層解讀演講提供一些建議。

關鍵詞：態度    元語言功能     演講

　　　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.