The purpose of this study is to examine how the theme changed compared to his early novels, focusing on the novel J. M. Coetzee’s Diary of a Bad Year. Coetzee’s novels have changed dramatically by being boldly out of its past form and themes that have been shaped in the past through later novels and using new issues in a new form. Among them, it is Diary of a Bad Year that is at the center of change. This article is about how the novels of South African diaspora writer is turning to new forms and themes is related to spatial migration and how this fact applies in Diary of a Bad Year. In this discussion, it is considered to be an important issue to study what changes Coetzee, who has embodied the issue of racism and ethics, is attempting to make in his novel after moving to Australia. Therefore, this study will examine how the writer reflects those themes to this novel by crossing public writing and private writing, and summarize the effects of migration of autobiographical space on narrative.