Abstract: Reviews on Watching Games manifests the theory and regime conception of the constitutional consultant Ariga Nagao’s constitutionalism in the early Republic of China. It contains the deeper basic theories and principles. His various conceptions of constitutionalism in the early Republic of China actually turned the regime reference line of the constitutionalism in the early Republic of China from republicanism country to monarchy country, which took the Meiji constitutionalism as the object of imitation. The corresponding prototype of these theories and principles can be traced back clearly to his early constitutional theoretical system, and furthermore to his constitutional enlightenment teacher Lorenz von Stein's theories. As Japan's political trends since Meiji constitutionalism in the early 20th century drifted off his constitutional expectation, He disguised these theories and regime conception and placed it on the constitutionalism in the early Republic of China.

Key words: Ariga Nagao, constitutional consultant, Meiji constitutionalism, constitutionalism in early Republic of China