Abstract: The ages of Zaizhi Group in Taizong were obviously young, and a large number of Keju origin young bureaucrats were quickly among them. The early staff of Taizong were full of the Privy Council, so the royal politics was new, forming the situation as Jinshi controlling Zhongshu, and the early staff of Taizong controlling Privy Council. The ruling from the prime minister to the Privy Council, the age showed a decreasing trend. However, the prime ministers were mainly the elders, played the important role in the key moment, and directly undertook the task of Tuogu. At the same time, Zaizhi changed frequently, the working period was not long, and the imperial power was strengthened.

Key words: Zaizhi, the age on duty, the length of service, promotion