From the academic frontier of modity and postmodity,the author aims at exploring the fission between modity and postmodity and also the characteristics of postmod cultural media from a philosophical vantage point.This paper illustrates three aspects of West modity:individual modity,social modity,and instrumental modity,and it also clarifies the issues in modity,starting by explaining three forms of the cultural fission:avant-garde,modism,and postmodism.The paper then demonstrates that the rise of postmodity represents a new transformation and new characteristics of contemporary Westem spirit,namely,the collision and compatibility of various concepts,in which popular culture and high culture,mass culture and elite culture,fashion and games as well as noise and silence have constituted an uncanny landscape of cultural media.This eerie landscape displays the indeterminacy of language,culture,art,consciousness,and aesthetics.From the perspective of theoretical innovation,the author proposes that the postmodem cultural media always displays its commodity and instrumentality,plays and entertainment,anti-culture and anti-art,replication and fabrication logically and practically as an outcome of post-industrial society.In conclusion,three critical issues are addressed:personal spiritual belief,the development of mass culture,and aesthetic principles.The postmodem cultural media has deeply influenced traditional culture,aesthetics,and how they are evaluated,resulting in cultural conflicts and a humanistic dilemma in the world of contemporary capitalism.