Lu Xun said: "It is intended to expose the drawbacks of the family system and ethics." The novel observes the people around him with the eyes and feelings of a persecutor. He felt that there were cannibals everywhere, and he was always in a fear of being eaten. It reveals that the feudal history of China for thousands of years is actually a history of cannibalism. Not only the ruler is eating people, but also the awakened one is unconsciously eating people. The history of cannibalism has a long history, which profoundly reveals the cannibalism essence of the family system and the old feudal ethics.

The novel links the sacred ethics and family system, which have been regarded as the code of conduct and norms for thousands of years, with cannibalism, revealing the historical truth that feudal society has been covered by the exaggerated mask of benevolence and morality: benevolence and morality are cannibalism; The history of China for thousands of years is a history of feudal morality eating people. Feudal cannibals are ferocious, timid and cunning. It exposes the depth and breadth of the moral poison of feudal ethics, and also pours into the author's extreme anxiety and angry feelings.

To examine the ability to understand the meaning of important sentences in drama, we should combine the main paragraphs and analyze them according to the theme of this novel.