Japan is called the Yamato nation, and the core of its national spirit is "collective departmentalism". "Collectivism" is the soul of the Japanese nation and one of the important reasons for Japan's rise and rapid revival in modern times. Its root lies in the homogeneity of Japanese culture and psychology.

Ancient Japan was made up of Japanese, ethnic minorities and mainland immigrants. Through long-term communication and integration, it has become a single nation in the process of political, social and cultural qualitative change. This single nation enjoys a unified culture and a homogeneous national psychology. On formal occasions, the relationship between superiors and subordinates in Japan gives people the impression that their status is very different. Subordinates always bow to their superiors, but in informal occasions, they will feel like a family with their superiors. There is no stratification in society, which eliminates the generation of class subculture, thus ensuring the homogeneity of Japanese culture.

Japanese culture tends to emphasize learning, imitation and comprehensive re-creation. The overall structure of Japanese tradition is a combination of "home", with the royal family at the top. This multi-level relationship with the same group has formed the political organization of Japanese society as a whole, that is, the country.