Gankun divination is an important divination in Yijing, which represents the concepts of heaven and earth, yin and yang, and everything, and is one of the foundations of Yijing theory. The essence of General Theory of Gankun Gua is the overall explanation and discussion of Gankun Gua, aiming at helping readers better understand the meaning and concept represented by Gankun Gua and its important position in the theory of Yijing.