We should unceasingly make a break through when researching the history of study of Changes in the aspects of methods

objects and contents

and probe the whole cultural field which was deeply influenced by The Book of Changes and all the important figures who studied and used study of Changes and their books and ideas. The thought of study of Changes in Qin and Han Dynasties developed by five stages as follows: Qin

Pre-Western Han

the middle and later periods of Western Han

the previous and middle periods of Eastern Han

and Later Eastern Han. The Book of Changes was the interior soul and important source of thoughts of Qin and Han Dynasties. The study and use of the former is the supporter of the latter. The history of thoughts of Qin and Han Dynasties can be regarded as the expansion of that of study of Changes