The origin of my essay is Barack Obama's 2008 victory speech. The essay is an attempt to illustrate the correlation between speech and policy from various aspects and perspectives. I hope the reader can improve the skills of persuasion power in speech. Because in political opinions, nothing is a coincidence. We can use our powers of persuasion to ensure things go the right way according to your plan. I found that there were some persuasive arguments in the victory speech. Language is powerful. Furthermore, politics is based on the power of influence. If politicians are good at persuasive strategies, the public can act and believe in the moral, political and cultural values ​​of the politician. Speech is one of the primary means that can change public thinking and behavior. “Politics is one of the social domains whose practices are almost exclusively discursive” (Discourse and Politics, 2009). The construction of discourse plays an essential role in politics. In Obama's 2008 victory speech, he used paragraph structure, lexical, and tones with formal form to grab listeners' attention. The victory speech is different from our daily dialogue, which conveys a clear and precise message of state change. To improve the effectiveness of message transmission, he used a tight structure and sophisticated lexical. There are mainly three positions in the political field. These are dominant hegemonic positions, negotiated positions and oppositional positions. Take the example of Article 23 in Hong Kong. The left wings supported him; therefore, they held the dominant hegemonic positions. The right represents opposition positions. However, a few people seem apathetic about it. They are negotiated... middle of paper ...... in the dust bowl and depression across the country, she saw a nation defeating fear itself with a New Deal, new jobs and a new sense of common purpose. . Yes, we can. (Transcript: “It's Your Victory,” Obama Says, 2008) “New Deal, New Jobs and New Meaning” were the positive, energetic words that implied a bright future. The triple was a method of creating emphasis. The use of the word “New” echoed the theme of change and brought the belief of rebirth. The speaker made careful lexical selection to reinforce the ideology. Additionally, alliteration was also a persuasive strategy, used to reinforce ideas and the main theme. Its peculiarity was to repeat the same first letter, in this case it was about despair, dust and depression. He could choose "dark" or "lowered" to express, however, he chose "despair", "dust" and "depression" to make alliterations..