The Jimifuzhou(羈？府州) system was a self-rule administrative and political organization system and it was first introduced in 630(太宗 貞觀 4年). Tang(唐) started to establish Jimifuzhou to install the Surrendered Households(降戶) after destroying Eastern Turkic(東突厥) in 630. At this time, Tang assigned chiefs of villages to the bureaucratic system by appointing them as Chishi(刺史) or Dudu(都督) and allowing them to pass on their duty to heirs. After this, Tang tried to maintain the imifuzhou with the changing circumstances of the north until the year 754(玄宗 天寶 13載). Tang changed the area where Jimifuzhou was established and its structures variably.
This article examined the change of Jimifuzhou that Tang Dynasty established in the north during the Early Tang Dynasty, from 630 to 754, on the structural standpoint. Also, this article divided the period into four parts to study the change of Jimifuzhou more easily. First, it is a foundation period from 630 to 646(貞觀 20年) and Jimifuzhou was first introduced. During this period, basic principles and other necessary things for Jimifuzhou were developed but the structure was not organized completely. The second one is a period of establishment from 647(貞觀 21年) to 678(高宗 儀鳳 3년). At this period, Jimifuzhou was established to Mobei(漠北) and Protectorate General(都護府) was established to control Jimifuzhou. Tang organized the Jimifuzhou system completely and controlled the system in the north more effectively. The Jimifuzhou made at this period was kept for a long time without changing. Next, it is a period of contraction from 679(高宗 調露 元年) to 720(玄宗 開元 8年). At this period, the area of Jimifuzhou was reduced and its role was cut back as Protectorate General, the umbrella organization, did not function properly. According to this change, Tang started to take several actions to maintain Jimifuzhou. That is, Tang had a chief of a military camp(軍鎭) in the north govern Jimifuzhou and set up administration of justice such as Chuzhihanghoshi(處置降戶使). Lastly, it is a period of reestablishment from 721(開元 9年) to 754(玄宗 天寶 13載). At this period, Jiedushi(節度使), regional military governors, governed Jimifuzhou. Especially, Tang used the Jimi system where Jiedushi played a central role instead of the Protectorate General as Shuofangjiedushi(朔方節度使) held the additional office of Yafanshi(押蕃使). It seemed that Tang tried to recover the control over Jimifuzhou in the north that Tang had lost during the period of contraction by reorganizing the system.
I hope that this article helps you to understand the Jimi system established in the north during the Early Tang Dynasty and how it changed.