During the reign of Emperor Xuanzong of the Tang Dynasty, the governor called the viceroy, who was in charge of festivals and called us envoys. The provinces and cities where the viceroy is located are equivalent to the provincial capitals. Although Xuanzong used to have administrative divisions of provinces, these administrative divisions had no actual power. For example, Hebei Province now came from Hebei Road at that time.

When our era was first established, as a military commander-in-chief, he was mainly responsible for military affairs and defense against foreign enemies, and did not manage the civil affairs of counties and counties. Later, it gradually took over the military, civil, financial, political and other affairs of a district, and it controlled the secretariat of each state under its jurisdiction. It also served as the secretariat of the state.

The Tang Dynasty initiated the Daofu system in the history of chinese administrative division. In the first year of Zhenguan (627), Emperor Taizong divided the world into 10 roads: Guannei, Henan, Hedong, Hebei, Shannan, Longyou, Huainan, Jiangnan, Jiannan and Lingnan. However, these roads have no real power. In the Tang dynasty, the city level was mainly the general manager's office, the governor's office and our special envoy. Counties are under the government. In the 14th year of Zhenguan (640), there were 360 states (states) in China, which governed 1557 counties. During the Kaiyuan period, Shannan and Jiangnan were divided into east and west, and three roads, namely, Gyeonggi, Duji and Qianzhong, were added to form a fifteen-way pattern. There are counties under the road, and there are counties under it. At the end of Kaiyuan, there were 328 counties in China, 1573 counties.