Notes on Zhouyi is an important book of Yi Studies in Ming Dynasty. The author has been studying Yi-ology in Zhideshan for twenty-nine years, emphasizing the unity of reason, qi, image and number, but slightly emphasizing image number, and making a big summary of Yi-ology since the Ming Dynasty. His annotations first explain the image meaning, word meaning and intricate meaning, and then add a circle to explain the true meaning of this hexagram, making Zhouyi a strict system and the most insightful.
The change of plum blossom number is one of the divination methods of ancient Han nationality, which is said to have been written by Shao Yong, a Yi-ology scholar in Song Dynasty. It is a book based on the mathematics in Yi-ology and combined with the "Xiangxue" in Yi-ology. When Shao Yong used it, every hexagram was sure to hit the target and proved to be effective. 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.
In addition, there are some other Yi-ology books that also record the methods of divination, such as The Forest of Fire Beads and The Book of Divination. However, it should be noted that these divination methods are all based on the principles and ideas of the Book of Changes, and they need a certain foundation and experience of Yi-ology to be correctly understood and applied.