The social and political reform movement in Japan took place in 646, which was the first year of Dahua. The history of this event is called the change of Yi Si. On the basis of the laws and regulations of the Tang Dynasty, the reformists carried out reforms from the economic to the political aspects, stipulated the centralized feudal state system, and announced the contents of the reform in the form of letters. Laws and regulations strictly divide the advantages and disadvantages of the identity system. Large-scale innovation has partially liberated productive forces, perfected Japan's ruling system and laid the direction for Japan's national development, which is of great positive significance.

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