Dreiser is a generally acknowledged writer as one of American’s literary naturalists.In Sister Carrie,the author skillfully used the naturalistic writing style which incisively and vividly showed the society environment at that time.The paper states the process that how the American dream in Sister Carrie disillusioned gradually. Dreiser is a generally acknowledged writer as one of American’s literary naturalists. In Sister Carrie, the author skillfully used the naturalistic writing style which incisively and vividly showed the society environment at that time. The paper states the process that how the American dream in Sister Carrie disillusioned gradually.