Voice-over, commentary, and narration were all commonly used in novel writing. They had their own characteristics and functions. Voice-overs usually appear at the climax or ending of the plot to provide the reader with additional information and feelings to enhance the drama and tension of the novel. Voiceover could be a sound, an image, or a combination of sound and image to guide the reader's emotions and thoughts. Commentaries were to insert a paragraph of explanatory text into the novel to analyze and describe the characters, plot, background, etc. to help the readers better understand the content of the novel. Commentators usually appeared at the beginning or middle of the novel, and they could also appear at the end to summarize and sublimate the theme of the novel. Voice-over was a narrator who did not directly participate in the plot of the story. He told the story of others, commented on the scenes or characters, and so on to promote the development of the plot and reveal the theme of the novel. Voice-overs usually appear at the beginning or in the middle of a novel to help readers better understand the background and characters of the novel, as well as to lay the foundation for the development of the subsequent plot. The similarities and differences between voice-over, commentary, and narration are mainly reflected in their forms of expression, functions, and different positions in the novel. Voiceover usually appears in the form of sound, image, or sound image. Commentators are usually written in text. Voiceovers can be written in text or in the form of sound, image, or sound image. The voice-over mainly increases the drama and tension of the novel, while the narration mainly helps the readers better understand the content of the novel. The narration mainly plays the role of promoting the development of the story and revealing the theme of the novel.