1. Highlight the theme: refine the theme of the novel and form a short and powerful slogan.

2. Quote classic lines: If there are classic lines or dialogues in the novel, they can be used as propaganda words.

3. Emphasize emotion: If there are strong emotional elements in the novel, it can be expressed in emotional language.

4. Create suspense: Set suspense to attract readers' curiosity and make them want to know more about the novel.