Shushu is one of big branches of Zhou Yi.

He was not only a famous Confucian scholar, but also a versatile classic in Cizhang, Shushu, astronomy, music, history and literature.

But because the thinks of Yinyang and Zhanshu had also the energies, the doctrine of Yi-wei came to the "little tradition" and was absorbed by the Shushu and Fangji.