Abstract: Modern Japanese polity theory including the thought of the kingdom of god,emperor-respected theory and moral principles is closely related to constitutional interpretation.In the main constitutional interpretations during Meiji,Taisho and Showa periods,the works on constitution evolved from the pure legal imperial sovereignty to its unique national characters of royal dignity,patriotic loyalty and loving countries.The political theology and moral principles continuously invaded the secular power system.The Emperor of Japan possesses the lasting and changeless sovereignty with the Japanese nationality while the national subjectivity was digested gradually.In interaction with constitutional interpretation,the works on constitution became the key property for fascism finally.

Key words: polity theory, interpretation of constitution, sovereignty, national characters