Persian fiction accelerated to social realism after annihilating Reza Khan pahlavi government. Because of mental and poletical tendencies, various literary processes appeard in the Farsi fiction realm. The writers consider the social, polectieal and ususl problems, as a mainly in their stories. The first congress of Iranian writers was convernd in Tehran (1325-1947) in purpose development and propaganda of socialist thoughts. Realism and prison literature flourished. Reigned partisans and adherent were interested roman and the poletical confliets bored the covitters and they sought asylum in surrealism. Realism became strong, so writers who escaped from society in formerly dacades, they bent to realism ream. Persian fiction was progressed in both novel and romane. Russion and American novelist influceneed Iranian novelist and the Persian novel fromed in a firm structure and form. In the end of twentics a few realistic and critical roman appeard more artistically. We can see a wonderful changing in the style and thought of Iranian novelists. However all the novitsts write about social problems, But most of them don’t have a deep view to society. A litrary sociologist can find many material for his studies in the litrary texts of this decad. Fiction prose became simple in this period and it was resembled to common language.