"The theory of alliance between China and Japan" which Akira Nagano s proposed in his works is covered with aggression and expansion ambitions,and its main purposes are to supply theoretic basis for Japan to occupy China,and help Japan to prepare for robbing Chinese natural resources.

There are many factors leading to the formation of Japanese militarism, with Bushido being the social basis for its formation and development, plutocrat monopoly economy its economic basis, aggression and expansion its core element, Mikado autocratic system of government its political basis, Shinto its social and ideological purport while social Darwinism as its theoretic basis.