Conceptual metaphor plays an important role in delivering political speeches for it can make abstract and complicated political concepts into clear and vivid statements.Therefore,it is often used by politicians.The American President Barack Obama often utilizes metaphors in his speeches and good at utilizing them.The weekly address is a typical representative of political discourse.This article is intended to analyze the conceptual metaphors used in Obama’s weekly addresses on the basis of the conceptual metaphor theory proposed by Lakoff and Johnson.The analysis shows that there are three categories of conceptual metaphors used frequently in Obama’s weekly addresses,which can be learned that how Obama uses conceptual metaphors to make speeches more vivid. Conceptual metaphor plays an important role in delivering political speeches for it can make abstract and complicated political concepts into clear and vivid statements. Herefore it is often used by politicians. The American President Barack Obama often able metaphors in his speeches and good at using them The weekly address is a typical representative of political discourse. This article is intended to analyze the conceptual metaphors used in Obama's weekly addresses on the basis of the conceptual metaphor theory proposed by Lakoff and Johnson. The analysis shows that there are three categories of conceptual metaphors used frequently in Obama's weekly addresses, which can be learned that Obama uses conceptual metaphors to make speeches more vivid.