"Add and Deletion Divination" is a six-line prediction work compiled and adapted by Li Wenhui (Juezi) of the Qing Dynasty based on the manuscript of Old Man Yehe. It was written in the 29th year of Kangxi (1690). This book is based on practice, screening traditional divination theories, retaining the proven content and forming a systematic divination system. The whole book revolves around good and bad luck, success or failure, and explains the principles of hexagrams based on hexagram examples, creating the first explanation method that uses examples to guide theory. The content covers basic concepts such as hexagrams, changes, and six clashes, and divides the scenes of fortune, disease, and wealth, and explains in detail the rules of selecting gods and the prosperity and decline of the four seasons, and the conflict between life and punishment.