Lu Xun's Diary of a Madman was a novel with strong symbolic meaning. Through the perspective of a mentally ill person, it revealed the darkness of feudal society and the distortion of human nature. The following is an appreciation of this novel: First of all," A Madman's Diary " was full of sarcasm. The protagonist in the novel was a crazy man with abnormal mental state. His behavior and speech were full of madness and abnormality, reflecting the closed and backward feudal society as well as the greed, selfishness and cruelty of human nature. Through this image, Lu Xun profoundly revealed the darkness of feudal society and the distortion of human nature, causing readers to reflect and think about society. Secondly, A Madman's Diary adopted the first-person narrative, which made the novel have a sense of realism and appeal. Through the perspective of the protagonist, the author truly reflects his inner world and state of mind, allowing the readers to have a deeper understanding of the theme and emotions of the novel. At the same time, this kind of narration also strengthened the fable and symbolic meaning of the novel, allowing the readers to understand the meaning of the novel more deeply. Finally, the use of language in " A Madman's Diary " was also very exciting. The language in the novel was full of sarcasm and humor, but also full of philosophy and deep meaning. The author used a lot of metaphor and symbolism to make the language of the novel vivid and artistic. At the same time, the structure and plot of the novel are also very good, full of suspense and twists, allowing the readers to constantly guess and explore the truth of the novel. Lu Xun's Madman's Diary is an outstanding novel full of symbolic meaning, irony and language art. It not only deeply reflects the darkness of feudal society and the distortion of human nature, but also has a strong artistic appeal and expressiveness. It has become a classic work of modern Chinese literature.