The Tang Dynasty was divided into administrative regions according to: Dao, state, county, Dao: there are officials in the third grade of the officials, such as the Secretary, disposal, transportation, etc. State: there is an assassin or governor grade in the fourth grade, fifth grade. Counties: there are county magistrates, seventh-grade officials, the army is divided into the central army and the local army, the central army is mainly the North Yamahan forbidden army and the South Yamahan forbidden army, the number of people in the 150,000 or so.

The Tang Dynasty, with its vast territory, initially renamed its counties as prefectures, and its governors were called assassins of the Han Dynasty, making it a one-level administrative division, with counties under it, and practicing a two-tier system of prefectures and counties. However, at this time, the world is no longer the size of 36 counties when the Qin Dynasty was founded, the number of states has increased to more than 300, the central government management is very inconvenient, and then in the counties on the state to add this monitoring organization.

Meanwhile, the Tang Dynasty was characterized by frequent internal and external wars, and in addition to the regular divisions of states, prefectures, and counties, there were also many military-oriented establishments such as passes, armies, and prisons. In the minority and border areas, the capitals and tie-up prefectures were established to strengthen the management. By the time the Tang Dynasty officially ended, there were more than forty provinces and feudal towns in the world, most of which were under the jurisdiction of sectional governors.

Expanded information:

In 848 (the second year of Emperor Xuanzong of the Tang Dynasty's Dazhong era), Zhang Zhichao, a native of Shazhou, started an uprising. In 848 (the second year of Emperor Xuanzong's Dazhong reign), Zhang Zhichao of Shazhou (Dunhuang, Gansu Province) revolted, and the Tang people responded by occupying the area. Then, Zhang Zhichao sent troops to capture ten states, including Gua, Yi, Xi, Gan, Su, Lan, Shanshan, He, Min, and Kou (the above areas are in present-day Gansu, Xinjiang, and Qinghai).

851 (Dazhong five years), Zhang Zhichao sent his brother Zhang Zhitan sand, melon and other eleven state maps into the dynasty, the Tang Xuanzong in Shazhou set the return of the army to the Zhang Zhichao for the festival, the river and the Long area and back to the Tang court control. 890, the west of the river, the Longyi and the occupation of the Dangxiang tribe. But the Tang Dynasty has completely lost control of the area west of Dunhuang.

Baidu Encyclopedia - Administrative divisions of the Tang Dynasty