In the middle of the Tang Dynasty, the administrative power of the Jiedushi envoy was extremely great, and the Fengzhen Jieshuai appointed the Jiedushi envoy on his own, choosing the officials to replace himself, and the subordinates to replace themselves, so that the Jiedushi made the formation of "family-oriented hereditary", which was the reality that the Tang Court was most reluctant to recognize, and it was also the highest form of the unlimited expansion of power by the Jiedushi. After the Anshi Rebellion, this phenomenon became more and more serious.
For the Tang Dynasty, the "Anshi Rebellion" was undoubtedly a sudden event. The loss of Longguan was even more a lingering dream demon of Xuanzong, who fled Chang'an in a panic without making any military arrangements. At that time, the Tang Dynasty was cut off from the local prefectures and counties, and the entire Tang Dynasty fell into a state of "anarchy". In order to cope with this dangerous situation, Tang Xuanzong set up a number of feudal towns in the interior, such as Henan, Hezhong, Shannandong, Jiangnandong, Jiangnanxi, and Qianzhong in the interior, some of which were led by the crown prince. It attempted to counter the Anshi rebels by introducing the feudal town system in the interior and giving the localities more political and military autonomy. After Emperor Suzong Lingwu ascended the throne, he continued to promote the "feudalization" in the interior in order to achieve the goal of "using the clan to control the domain". In order to strengthen military security in the Guanzhong area and to curb the offensive of the Anshi rebels in the Henan battlefield, the towns of Bianhua, Zhengchen, and Ziqing Pinglu were set up; in order to stop the Anshi rebels from going south to Jianghuai, they also set up the jiedushi envoys of ShannanDongdao and Huainanxidao; In order to strengthen the control of the Jianghuai region and ensure that the wealth of Jianghuai was imported into the Guanzhong region, Suzong set up huainan, zhejiang dongdao, west and other festival towns.
According to the author's statistics, the number of additional feudal towns added in the interior during the reign of Emperor Suzong included jiedushi, observation, defense, and economic envoys, as many as 40. It can be seen from this that in order to quell the anshi rebellion, Emperor Suzong implemented the policy of "using the clan to control the clan", and set up a large number of clan towns in the interior. The largest number of fan towns were set up in the four provinces of Guannei, Henan, Shannan, and Jiangnan, mainly to prevent the spread and infiltration of the Anshi rebels into these areas and to stabilize the situation in these areas; the three provinces of Huainan, Hedong, and Jiannan were very few, mainly because these areas were relatively stable during the Anshi Rebellion. Due to tubo invasion, Emperor Daizong placed the remnants of Anshi's rebel forces in the Hebei region, forming the so-called Heshuo towns. After the Anshi Rebellion, there was no trend toward a significant decrease in the number of feudal towns, because it was relatively easy to increase the number of feudal towns, but it was more difficult to abolish the feudal towns. The change in the number of feudal towns during the Daizong period reflected the "appeasement" policy of the daizong period towards the feudal towns, that is, to try to stabilize the situation of the feudal towns, and the number of feudal towns in this period did not increase significantly.
During the reign of Emperor Dezong of Tang, due to the Jianzhong War and the "Fengtian Difficulty", the number of feudal towns varied greatly. In the War of Emperor Dezong's Jianzhong Dynasty, in order to oppose the three towns of Heshuo, Li Xilie's town of Huaixi, and Li Zhengji's town of Ziqing, the military layout was carried out by adjusting the number of feudal towns and jurisdictional areas in Henan, so that many of the feudal towns in Henan were added and abandoned. In the "Fengtian Difficulty", in order to deal with the rebellion of Zhu Shu and the rebellion of Li Huaiguang, the Tang Court set up a number of new feudal towns in the Kannai area, but many of them were abandoned after the war. During the reign of Emperor Dezong, the number of feudal towns was extremely inflated, and 25 more feudal towns were added.
The Tang Dynasty helplessly set up a large number of feudal towns, and finally accumulated a lot of difficulties, and finally went to the road of the demise of the feudal towns, the Anshi rebellion, the Tubo attack, and the Fengtian difficulty three disasters made the Tang Dynasty have no choice, only to drink and quench their thirst, and finally kill themselves.