Insanity is a family resemblance in Dostoevsky's creation,which has attracted the attention of Slavic scholars abroab and in China for a long time.However,most of them only focus on the aesthetic value of insanity but ignore poetic characteristics in writer's fictions.Indeed,insanity is not only the start mechanism of the aesthetic events,but also the very element of suffering aesthetics and plays a role as a medium of thought.One of the major reasons that Dostoevsky's philosophical ideas tend to be presented in a fragmented form is that the path of thought is related to insanity.Nikolay Strakhov in the 19th century and Reinhard Lauth in the 20th century both hold that the writer's physical feelings directly lead to the abnormal spirit of the characters in the works.Bakhtin emphasizes the dialogism and polyphony of the writer's works,but also finds that there is"other in my eyes"in the individual consciousness,which is diametrically opposed to the individual,providing a theoretical basis for the insanity making thought.