Doomsday novels were a type of novel with the apocalypse as the background. They usually described the various flaws and contradictions in human life, society, culture, politics, and other aspects before the apocalypse, as well as the various survival crises and challenges that humans faced after the apocalypse. Due to the wide audience of doomsday novels, the writing style and content of these novels were also varied. Some novels would focus on the survival and struggle of humans after the apocalypse, some would focus on the preparation and struggle of humans before the apocalypse, and some would focus on the horror and despair of the apocalypse. Doomsday novels with more than a million words usually contained a large number of plots, characters, and story lines. They required the author to have a rich imagination and writing skills. In this type of novel, the author would usually construct a huge worldview and use the novel to show the customs, history, culture, religious beliefs, and so on. Doomsday novels were a kind of literary work with a strong imagination and a spirit of exploration. It could let the readers feel the dark side of human nature and the power of the desire to survive.