The Abandoned City was a story about an abandoned city after the end of the world. It described the living conditions and relationships of the people in the ruins of the city and explored the collapse of human civilization and the nature of human nature. By comparing the advantages and disadvantages of human civilization and beast civilization, the novel raised the philosophical question of "human nature is good" and "human nature is evil". The human beings in the novel showed a selfless and noble quality of sacrificing themselves to save others, but there was also a selfish, cruel and degenerate side. The novel emphasized the complexity and variety of human nature through the deep reflection and discussion of the nature of human nature. At the same time, the novel also showed the helplessness and despair of human beings in the face of disasters through the description of the living conditions and relationships of the people in the ruins of the city, reflecting the survival instinct and desire of human beings in the face of crises. Therefore, the core of the thought of Abandoned City was the reflection and discussion of human civilization, humanity, and crisis.