The Tang Dynasty (618 - 907) initiated the organizational structure 'Dao' and 'Fu' to divide the political districts. During Zhen Guan's Reign, the national territory was divided into ten political districts called 'Dao', which increased to 15 in the Heyday of Kaiyuan. The subordinate political districts were called 'Zhou' or 'Fu'. The more subordinate administrative structure was in turn 'Xian' (town), 'Xiang' (five 'Li's), 'Li' (a hundred families), 'Cun' (village), 'Bao' (five families) and 'Lin' (four families). At the end of Kaiyuan reign, there were 328 'Zhou's and 1,573 'Xian's.
The official system involved the central official system and local official system. The central official system followed the Sui Dynasty's (581 - 618) Three Departments and Six Ministries system. In addition, nine 'Si's and five 'Jian's were set up to work with the six ministries. The local official system was in line with the political administrative structures, of which the chief official title were called 'Guancha Shi' (observer of Dao), 'Ci Shi' or 'Tai Shou' (chief officer of Zhou), 'Xian Ling', 'Qi Lao', 'Li Zheng', 'Cun Zheng', 'Bao Zhang' and 'Lin Zhang'.
Compared with any other dynasties in Chinese history, the Tang Dynasty had the most comprehensive and the most detailed legal system. Generally, the legal system included four basic forms, namely, 'Lu' (criminal law), 'Ling' (institutional regulations), 'Ge' (administrative rules) and 'Shi' (formulas of official documents). The Tang Lushu Yi, compiled in the reign of Emperor Gaozong was a representative code of feudal laws, which contained criminal law, law of safeguard and defense, law for imperial officers, law of marriage and census registers. The regulations were fairly complete and the legal provisions were rather concise. Especially, in the early period of Zhen Guan's Reign, Emperor Taizong focused much attention on listening to wise advice while enforcing the law. In this way, a peaceful social order was established, setting up a good example for later dynasties and even for some other imperial states in Asia.
Imperial Examination System
Stone Statues of 61 Foreign Officials,
Qianling Mausoleum, Tang Dynasty
Generally, the Imperial Examination System was a progressive examination which allowed intellectuals born in poor families to have the opportunity to become an officer in the court. Speaking from the imperial part, this examination system helped to enhance the centralization of imperial power and to promote the unification of thought.