Concerning the nature and belonging of Wang-jia-tai’s Dininatory Symbols on Bamboo Slips of Qin Dynasty,someone holds it belongs to Guicang while some others insist it is Yin Yi or other different sources. However,if the divinatory diagrams,symbols and oracle inscriptions are taken into consideration,it is still a history book of divination. Through the study on divinatory symbols in Yin Ruins,Yin Yi belongs to the divination of Shang Dynasty with divination symbols on bones found in Si-pan-mo and divination symbols on shells found in Xiao-tun-nan-di as the representatives. As far as Guicang is concerned,many versions have been developed with one thing in common:no real records. It never exists.