This book studies acceptance of political system of China in countries of East Asia and establishment and changes of central government in early Koryŏ(高麗) period. The author who majored in institutional history as major questionary wrote 8 papers after his doctoral thesis to investigate the reason for acceptance of three department-six board system, 3sŏng 6pu(三省六部) without any resistance in Sŏngjong(成宗) period. This book is being corrected and complemented of these 8 papers.