Song Zhong emphasized reasoning by means of entity and acadamic argument,trying to eradicate superstitious elements.While he paid much attention to "xiangshu",he didn’t ignore behavioral rules,which recovered the tradition.Just like Zheng Xuan,when explaining The Book of Changes,Song Zhong thought much of some phenomena.At the same time he absorbed Xun Shuang’s "yin and yang theory".Song Zhong valued the coordinate of "gua yao(卦爻)" and the relationship between the six "yao(爻)" to show his own thoughts,which stated that he was greatly affected by The Changes of Eastern Han Dynasty and Western Han Dynasty.Song Zhong explained The Changes by means of biography,such as Yi Dazhuan.Song Zhong’s explanation on The Changes indicates growing up and maturing of "Yi Li School".
