Dream of the Red Chamber is a novel with an obvious self-preface. The self-preface plays a vital role in the plot, characters and theme of the whole novel. In the preface to 'Dream of the Red Chamber', the author Cao Xueqin first introduced her own creative background and intentions. He wrote: "In the third month of Jiashen, I saw Cao Xueqin revisiting Nancun in a stone dream. I was inspired by this strange scene and drafted this draft in a stone dream." The preface also introduced the theme and structure of the novel in detail. Cao Xueqin emphasized the theme of the novel in her preface---"Wealth, glory, marriage, family, life, and all kinds of people" and introduced the structure of the novel. Through the description of the main characters such as Jia Baoyu, Lin Daiyu, Xue Baochai, etc., it showed the wealth, glory, marriage, family, and all kinds of people in China's feudal society. In addition, the preface also wrote about many important characters in Dream of the Red Chamber, such as Lady Jia, Lady Wang, Xue Baochai, etc., and described their personality characteristics and relationships in detail. These descriptions also laid the foundation for the plot and character setting of the entire novel. Therefore, the preface was an important part of the novel. It introduced the theme, structure, and main characters of the novel in detail through the author's confession and introduction. It laid the foundation for the plot setting and character description of the whole novel. Therefore, it could be said that the novel was obviously self-preface.