" Book of changes" is the ancient Chinese book, up and down the sixty-four hexagrams, composed by gossip, with emphasis on the interpretation of heaven, humanity, and miscellaneous harmony idea. Since ancient times," book of changes" of nonstop, different times, different scholars with different research perspective to jointly study the "book of changes". " Book of changes" research is divided into two factions that as the number of the book of changes and the meaning changes. Mr. Wang Zhenfu in" the big easy beauty" said: " on the book of changes is a Chinese ancient culture of the black hole, a mysterious dark bottomless abyss, regardless of how much you to it, it will not have echo. " Book of changes" reserve lies in its silence, silence is the deep humanities force." From this, put forward the proposition that the hidden dragon, first seen in" book of changes", in the early classic of Yao" ninth day, hidden dragon". 还望采纳吧