Dispelling the depth perception , historical sense and the subjectivity , postmodernism steps into the world of polypho-ny, which is also the focus of Mikhail Mikhailovich Bakhtin who advocates the equal communication among different languages , dif-ferent voices .With the help of manifestation patterns of modernism and postmodernism , mixing fabrication and non -fiction narra-tive methods, the representative of post -colonialist literature, J.M.Coetzee, demonstrates us a polyphonic world with using the u-nique narration modes in Diary of a Bad Year .In the novel , which make the novel full of limitless space dimension .