As the origin of Chinese culture and philosophy, the Book of Changes must be studied to develop an understanding of the characteristics of Chinese culture and philosophy. Many Gua in the Book of Changes had their themes and emphases. Thus an appropriate understanding of Gua and instructions of Gua Yao requires a grasp of their themes and semantic bases. In this regard close attention needs to be paid to the Universal Climate, which proves greatly helpful for revealing the themes and ideas of Gua and Gua Yao. Therefore to study and give note to the Book of Changes ought to depend on the Universal Climate for an appropriate explanation of the semantic bases and images of Gua and Guayao, totally giving up both Wang Bi’s and Gao Heng’s means.

The Universal Climate; The Instructions of Gua; means of interpretation; Wang Bi; Gao Heng