In the later development process, Yi-ology gradually divided into Yi-ology, Elephant Mathematics, Mathematical Science and Naiyin Science. Yi-ology, also known as Yi-ology, is a kind of Yi-ology that focuses on the philosophical significance of Zhouyi. The purpose of image number learning is to use; Mathematics Yi-ology is the study of scientific and mathematical ideas in the Book of Changes. Yin Na Yi-ology combined Yi Li Yi-ology and Xiang Yi Shu Yi-ology.