Lu Xun's self-titled portraits referred to the sculptures of the characters in the novel " A Madman's Diary " that he wrote for himself. In the novel, Lu Xun created the image of a madman with a wild appearance and a lonely heart. Through this image, he expressed his criticism and doubts about the social reality at that time. Self-titled portrait was a literary form. In addition to retaining the existing image in the novel, it would also give a name or code name to the character image created by oneself according to one's own imagination and creative intention to represent and highlight the personality characteristics and emotional content of the character image. The image of a madman in Lu Xun's self-titled portrait, A Madman's Diary, was a deep reflection and criticism of the social reality of that time. Through this image, Lu Xun expressed his strong opposition to feudalism and the old culture, as well as his deep insight and thinking about human nature.