The purpose of this study is to derive the features of Dance Flash Mob and binary opposition structure and to understand the ideology inherent Dance Flash Mob in the film Step Up 4: Revolution . The results are as follows: First, through the syntagmatic analysis, identified that the narration structure of the film was divided by inception, development, crisis, and climax, ending in accordance with the timely arrangements. The features of Dance Flash Mob in the film are temporality, unlocation, stagization of ordinary spaces, harmony of costumes, composition of dance beyond genre, communicability of message and so on. Second, through the paradigmatic analysis, confirmed that three binary opposition structures of 'ruling class vs. ruled classes', 'daily life vs. deviation', and 'demonstration arts vs. criminal behaviors' were formed in the film. Third, through the ideology analysis, appreciated that Plural Eclecticism, Communitarianism, and Cultural Populism containing in the film.