The Fǔbīng system (府兵制), also romanized as Fu-ping, was a local militia system existing in China between the 6th century and 8th century. It originated in the Western Wei dynasty, and was subsequently used in the Sui and Tang dynasties.
The basis of the Sui and early Tang militaries was the fubing militia system, first employed by the Western Wei, under Yuwen Tai's administration. These militia units also served as reserves, and could be mobilized quickly in times of war or political instability.
The system involved a network of militia who were assigned tracts of land. Men between 21 and 60 years of age were eligible. Officers received permanent commissions, but regular troops reported for duty at the province capital on a rotation system that varied upon living distance. Those who lived 500 li from the capital served one month every five months, and those over 2000 li away served for two months every 18 months. When off-duty, they would farm their land, but when a war occurred, they would be re-mobilized. This supplemented the equal-field system, which assigned all households a share of land to farm. These units subsequently became hereditary military families, and ushered forth vast militarized settlements and communities.
The Sui placed these units under local civil administration, and later the Tang incorporated them under metropolitan control, more specifically the Ministry of the Army. The Tang fielded 634 militia units, later called Zhechongfu. Each unit consisted of 800 to 1200 men, and in turn were subdivided into tuan of 300, dui of 50, and huo of 10. Many were concentrated in the northern region, especially in Guanzhong, which alone fielded 261 militia units, the rest included 164 in Shanxi, and 74 in Henan and Shandong, all constituting about 80 percent of Fubing conscripts. Fubing required little government expenditure, since militiamen could support themselves by farming.
The Fubing system only had provisions for brief military campaigns and peacetime. Prolonged warfare would prevent the cultivation of agriculture for the economy. Fubing was gradually abandoned in favor of full-time army units, known as Jian Er (健儿).
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