The original case reasoning and the new original case reasoning are two basic schools of mystery novels. The main difference lies in their theoretical basis and technique description. The theoretical basis of original reasoning (formerly known as traditional original reasoning) was the "Syllogism", which was the structure of "asking questions, answering questions, and solving problems" that all mystery novels had to follow. In this method, the reader finds a problem in the novel and the author must give an answer before the reader can come to a conclusion. Benji's reasoning emphasized logic and mathematical principles, emphasizing the rigorous reasoning process and detailed analysis, usually requiring the reader to infer and think for himself. Neo Bengue Reasoning (also known as modern Bengue Reasoning) emphasized the story plot and character creation more than Bengue Reasoning was more literary and romantic. In this method, the author not only has to ask questions, but also solve them through the plot and character portrayals. The reader's reasoning process is more integrated into the whole story. Neo Benji's reasoning also emphasized logic and mathematical principles, but it focused more on using these principles to solve problems in the story. Generally speaking, the original case reasoning and the new original case reasoning were both forms of mystery novels. The difference lay in the theoretical basis, the description of the technique, and the emphasis on the key points.