The writing techniques and precautions for suspense novels were as follows: 1. Suspense setting: The core of a suspense novel is to create suspense so that the reader can constantly guess and think about the plot during the reading process. The suspense should be enough to keep the reader interested and keep reading. When setting up suspense, one could increase the reader's guess and reasoning by creating contradictions, concealing the truth, and hinting. 2. Clue presentation: The clues of a mystery novel are an important element to promote the development of the story. The clues should be clear enough for the reader to easily understand and deduce the plot. When laying out clues, he could increase the reader's guess and thinking by describing the details and hinting. 3. Character Creation: The characters in suspense novels should be three-dimensional and have flesh and blood. They should have their own characteristics and personalities so that readers can better understand and sympathize with the characters. At the same time, the character's personality and characteristics should echo the story to increase the interest and depth of the story. 4. Story structure: The story structure of a suspense novel should be compact and complex, and there should be a clear beginning and ending. The structure of the story should be able to attract the interest of the readers and make them willing to continue reading. 5. Pace control: The rhythm of a suspense novel should be controlled well so that the story is not too dragged or too rushed. The readers should feel the tension and suspense at the appropriate time while maintaining the cohesiveness and rationality of the story. 6. Ending Reversal: The ending of a mystery novel should have one or more reversals to surprise the reader at the end. This kind of reversal should be in line with the development of the story and also increase the interest and depth of the story. Writing a mystery novel required patience and skill, and it required constant practice and experimentation.