Postmodernism is a movement whose limits are not clearly defined. Besides this thereare many differences of opinion about how and in what ways it is reflected in the works of art;according to some it is accepted as a style, whereas for others, it is an ideology. Style accordingto its definition in dictionaries is an ideology for the authors such as Habermas and Jamesson,while for the authors like Baudrillard and Lyotard, postmodernism which is the name of aperiod created by media and technology which gave birth to new information and life-style isa debated subject on how it is reflected on art works. Therefore in this paper the researchers who look at postmodernism from different angles will be mentioned about their understandingof Postmodernism through primary sources and its reflections on art works through exampleswill be revealed in general terms. Later, the reflection of postmodernism on literature will bementioned. While doing this, the previous researches and debates on postmodern literary theory will be evaluated. After these evaluations it will be pointed out which techniques andmethods should be applied when subjecting a literary work to postmodern criticism. Alongwith this, the definitions of the technique used by postmodernism and its scope and the reasonwhy it should be used while studying a postmodern work will be explained. In addition andas a result of these discussions, it will be claimed that postmodernism should be evaluated asan ideology, by considering the fact that postmodernism is attempting to establish apostmodern society in the developing media age. In addition, it will be shown that there is noevaluation of the content of the work examined in postmodern literature studies, and thereforethere is no theme that can be considered as a postmodern theme. It will be tried to explainthrough examples that Conspiracy Theories are a theme for postmodern literature, and thenit will be shown why conspiracy theories should be considered as a postmodernist theme. Dueto this ideological structure of postmodernism, it will be concluded as a natural consequencethat postmodern literary theory will be shaped accordingly. Therefore, in the end it will berevealed that not every literary work that uses multi-narrative technique and progresses withfigural plays, should be evaluated as postmodern.