Modern literature was divided into different schools according to different standards. The following are some common criteria for the classification of modern literature: 1. Style: Main basis. For example, the main characteristics of modern literature were anti-tradition and anti-rationality, while romantic literature was rich in emotion and imagination. 2. Genre of theme: It is mainly divided according to the theme or content depicted in the work. For example, the main feature of realism literature was to describe real life, while expressionism literature was to express the artist's inner feelings. 3. Political genre: It is mainly divided according to the social and political situation reflected in the works. For example, the main feature of the literature about the socialists was to describe the socialistic society. The main feature of the literature about the capitalists was to describe the capitalist society. 4. The social genre: It is mainly divided according to the social background depicted in the work and the living conditions of the people. For example, the realistic literature that reflected social reality and the modernist literature that focused on the fate of individuals. 5. Cultural genre: It is mainly divided according to the cultural environment and cultural background depicted in the work. For example, the literary works of cultural symbolism are mainly featured by depicting cultural symbols and symbols, while the literary works of cultural realism are mainly featured by depicting real life. These standards for the division of schools were not absolute. Different standards for the division of schools might produce different literary schools. At the same time, the emergence and evolution of these schools were also complicated. Some schools might cross and influence each other.