On the gua-qi theory in Yi Zhuan copied on silk

This paper discussed the gua-qi theory (a theory describing the correspondence be-tween the hexagrams and Chinese seasonal points) contained in chapters of Er San Zi, Yao, Zhong in Yi Zhuan copied on silk, pointing out that Yi Zhuan copied on silk and that in cur-rent version are closely correlated. This qua-qi theory and earlier qua-qi theories can be traced back to the same origin. On the basis of this qua-qi theory, the qua-qi theory of the Han Dy-nasty was established and perfected. To discuss the existence of qua-qi theory in Yi Zhuan copied on silk is important for us to push forward the research on the image-number school of I Ching learning of the western and eastern Han dynasties.