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This was an ancient Japanese coup in 645. Its main content is to abolish the monopoly regime system of heroes, learn from the emperor system of China, and establish an ancient centralized state. Great changes have taken place in Japanese history.

Before the Dahua reform, the Su clan and other imperial families controlled the political power, and the royal family had no real power. In June 645 AD, the eldest brother of the royal family, the Prince (later Emperor Tianzhi), and the noble Nakatomino Kamatari staged a coup, assassinated the powerful minister who was in charge of state affairs at that time, and his father committed suicide, and the royal family seized power. Zhong, Prince and others all support it.

After Emperor Kotoku (reigned from 645 to 654) acceded to the throne, it was difficult to move the capital to Bojing (present-day Osaka).

"Dahua" means "great change" in Japanese.

On New Year's Day in 646, the imperial edict of innovation was promulgated and political reform was carried out, which was called "Dahua Innovation" in history. Since then, Japan has formed a centralized country headed by the Emperor.

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(1) Imitate the land equalization system in Sui and Tang Dynasties, and implement the method of dividing fields. Abolish the private ownership of land and people by aristocratic families and change the land and people into state-owned ones. The state gives cultivated land orally to citizens over six years old, and gives it to Kubanden once every six years according to the population class. This kind of land shall not be bought or sold, and shall be returned to the government after death.

(2) Imitating the tenancy system in the Tang Dynasty, farmers who receive farmland must pay grain (rent), hard labor or Nabu service (rent) and local products (rent) to the state.

(3) There are two officials in the central government: Shen Zhi Guan, Zheng Tai Guan and eight provinces (central affairs, military affairs, political affairs, people's affairs, Ministry of War, Ministry of Punishment, Okura and Palace), and one (Zheng Tai); Generally, there are countries, counties and provinces in the local area.

(4) In terms of military system, there are five Fu Wei in the capital, and local legions are set up for citizens to perform military service.