According to legend, Yi Shu of Plum Blossoms was written by Shao Yong, a scholar of Yi Studies in Song Dynasty. It is a divination book based on mathematics in Yi-ology and combined with "Xiang-ology" in Yi-ology. According to legend, when Shao Yong used it, every hexagram must be correct, and it always works. According to innate gossip's mathematical theory, the number of plum blossoms is changeable, that is, dry one, change two, keep three, shake four, lose five, talk six, root seven and Kun eight. Divination can be started anytime and anywhere, and there are various ways of divination.
Generally speaking, it is a kind of wisdom to predict good or bad luck and let people live in harmony with nature better.