The theory of the subject matter and theme of literary works refers to the exploration and analysis of the subject matter and theme suitable for literary works in order to help readers better understand the meaning and extension of literary works. The main categories of literary works were as follows: 1. Historical theme: A literary work with historical events, historical figures, social systems, etc. as the theme. 2. Sci-fi theme: A literary work with the theme of future technology, universe exploration, extraterrestrial life, etc. 3. Realistic theme: literary works based on real life, social reality, personal experience, etc. 4. Mythological theme: literary works with mythological stories, religious beliefs, etc. as the theme. 5. Horror theme: A literary work with horror, horror, suspense, etc. as the theme. The main categories of literary works were as follows: 1. Love theme: A literary work with love, romance, lovesickness, etc. as the theme. [2. Life and Death Themed: A literary work with life, death, reincarnation, etc. as its theme.] 3. Freedom and equality theme: literary works with the theme of freedom, equality, human rights, etc. 4. Salvation and faith: Literature works with the theme of salvation, faith, self-redemption, etc. [5. Social criticism theme: literary works with social reality, system, culture, etc. as the theme.] The following points should be noted in the discussion of the subject matter and theme of literary works: The subject matter and theme of a literary work are diverse. We should not limit or emphasize a certain type or theme. The theme of a literary work should not only be the author's personal thoughts, but should also be related to the social environment, historical background, cultural traditions, etc. The choice of the subject matter and theme of a literary work should take into account the needs and preferences of the readers, as well as the value and significance of the work itself. The subject matter and theme of a literary work should be representative and reflect the current situation and problems of society and history.