Sui and Tang Dynasties is another great development period of China's feudal social and political system after Qin and Han Dynasties, and its basic framework has been influencing the later period of China's feudal society. The rulers of Sui Dynasty took measures to strengthen the centralization of feudal absolutism, such as setting up three provinces and six departments to improve the administrative efficiency of government departments; Reform local institutions and strengthen central control over local governments; Establish the imperial examination system and expand the foundation of the landlord class regime. On this basis, the Tang Dynasty further improved the autocratic centralized politics and became the unprecedented heyday of China feudal society.

The Five Dynasties, Liao, Song, Xia, Jin and Yuan, were the period when China split from a unified feudal dynasty and then reunified. During this period, the frontier areas were further developed and the ethnic integration was unprecedentedly strengthened; Centralization was further strengthened. The rulers of the Yuan Dynasty set up a book province in the local area, and later developed it into the name of administrative region, which initially laid the scale of the Ming and Qing Dynasties and even contemporary provinces and regions. The Yuan government set up a patrol inspection department in Penghu Island to administer Penghu and Taiwan Province Province. Zheng Xuan, the central government of the Yuan Dynasty, directly governed Tibet, and Tibet officially became the administrative region of the Yuan Dynasty. The Yuan Dynasty strengthened the ties between the central and local governments, the Central Plains and the border areas, and consolidated and developed a multi-ethnic unified country.

The Ming and Qing Dynasties (before the Opium War) was a period when the unified multi-ethnic feudal country developed further and the feudal system declined. In the early Ming Dynasty, the autocratic regime was strengthened in an all-round way, and the imperial power had absolute authority, which became the characteristics of the political system of the Ming Dynasty. The military department was the central organization in the Qing Dynasty. The establishment of the military department not only reduced the links of the emperor in handling state affairs, but also improved the efficiency and confidentiality of the emperor in handling government affairs, which was the embodiment of further strengthening the centralization of feudal absolutism. The establishment of Fan Liyuan has strengthened the central government's jurisdiction over all ethnic groups in the border areas as never before. The territory of our country has finally been determined. The system of titles of Tibetan religious leaders, the system of drawing lots from golden jars and the system of ministers stationed in Tibet have strengthened the jurisdiction over Tibet, which has been imitated by later generations.