Abstract: It is the core in Bakhtin’s theory that discourse possesses the feature of dialogism,which is shown in two aspects.Firstly,when discourse is used to address its object,it produces dialogue with other discourses;secondly,the dialogism of discourse is presented with the precondition that the listener does exist,and its purpose is to acquire reply and dialogue.Based on whether dialogism is presented or not in structure and form,Bakhtin classifies text style into novel and poem,and he further thinks that compared with natural sciences,the essence of social sciences such as poetics lies in that it takes discourse as its way of existence,and it has an internal dialogism.

Key words: Bakhtin, discourse, dialogism, novel, poem, social sciences