Abstract: During the Meiji Reformation,the reign of the Mikado and parliament became the new political principles under the rule of Meiji constitution.The constitutionalism,political theology and the political ideology of the integrity of Mikado and subjects reinforced with each other,thus the Mikado system was reestablished,which was called Mikado System and Constitutionalism.In this system,Mikado held all the powers,which also made it difficult for him to execute them.During the Taisho period,the personal ideas of Mikado could be “ignored”,so the Mikado system could integrate with the populace politics.Emperor Hirohito held all authorities while paying respect to the constitution.However,as the rule of political party ended and the war began,the imperial rule assistance system took over Japan.After the World War II,people’s sovereignty and symbolic Mikado System were confirmed and the bond between Mikado and people became much closer.

Key words: Mikado System, tradition, constitutionalism, constitution