This study is a Critical Discourse Analysis of Obama's inaugurations speech. To investigate the linguistics and grammatical elements those are used in Obama's inauguration speech. The study adopted eclectic method; descriptive analytical method, observational method and qualitative method. The researcher used a number of instruments to collect data from different sources; recorded video, a script and note taking technique. The study concluded that Barack Obama has been effective in his political career by virtue of his wonderful rhetorical abilities. The choice of expression in Obama's inauguration speech is investigated regarding lexical classes, syntactic classifications, figures of speech, and context and cohesion. The study recommended that Students of linguistics should make discussions about different speech practices and strategies.