Lu Xun's Madman's Diary was a famous novel. Through the description of the protagonist, the madman, the author expressed his strong criticism of feudal ethics and traditional culture, as well as his deep thinking about human nature. In the novel, the madman's behavior and speech were described as extremely abnormal to express his negation and rebellion against traditional morality and culture. Madman's diary was full of criticism and challenges to traditional culture and social order. In this way, Lu Xun expressed his strong opposition to feudal ethics and traditional culture, as well as his yearning for the freedom and liberation of human nature. The implied meaning of " A Madman's Diary " was that feudal ethics and traditional culture were not only a kind of restraint and oppression, but also an obstacle to human progress and freedom. Through the description of the madman, the novel showed the dark and twisted side of human nature, thus calling on people to abandon the shackles of traditional culture and pursue freedom and liberation.