The research of “Multiculturalism in American Society Represented in Adolescence Literature Heroes of Olympus Novel Series” is intended to gain understanding about the representation of multiculturalism in adolescence literature. Understanding multiculturalism is important because it helps theintercourse in multicultural society. The purpose of this research is to understand how Heroes of Olympus novel series portrays multiculturalism in American society. The main data of this research are collected from five novels. Roland Barthes’ semiotic theory is used to analyze the data in order to catch the message conveyed through this novel series. This research is expected to gain academic significance in the field of American Studies in multiculturalism, and practical significances to give conception on how multiculturalism is represented in popular media and give education on the ideal application of multiculturalism for adolescents.