Rong Zhai”s Essays, an ancient notebook novel. It has a wide range of content and rich materials, including classics and history, literature and art, laws and regulations of the past dynasties, medical divination, ephemeris, anecdotes in the Song Dynasty, and character evaluations. There are test books to remove the false and save the truth, and there are also reasonable analysis, among which the summary of some historical experience is quite insightful. Summary of the General Catalogue of Imperial Collection of Four considers it to be the first of the notebook novels of the Southern Song Dynasty. It is recognized by historians as a must-read for studying the history of the Song Dynasty.