The clues in the novel referred to the elements used to guide the reader to read the plot and the development of the characters. They usually included character relationships, character backgrounds, character personalities, plot twists, location changes, cause and effect of events, and so on. Through the laying out of clues, the author could guide the readers to understand the characters and plots in the story and establish their understanding of the story world. In a novel, clues could be exposed or hidden, directly presented, or hinted by the character's words and actions or the environment. Bright lines referred to the clues that the author directly showed in the novel, such as character relationships, plot twists, location changes, etc. Hidden clues referred to the clues that the author revealed through hints and metaphor, such as the character's personality, background, relationship, and so on. The role of novel clues is to help readers understand the story, the characters, the plot, and finally the theme and emotions of the novel. Therefore, when writing a novel, the author needs to pay attention to the laying out and application of clues in order to let the readers better understand and experience the novel.