The two Offices of Grand Protectors of Anxi and Beiting were governing bodies directly mandated by the Tang Dynasty, headed by a Grand Protector or Protector, whose official rank was very high, equivalent to sub-second-tier or third-tier in the imperial ranking system, the same as state ministers or vice prime ministers. Under the(Grand) Protector were two Deputy (Grand) Protectors, one Senior Official and one Si-ma. There were special divisions in the Office of Grand Protector dealing with administrative, military, judiciary and financial affairs respectively, with corresponding posts such as gongcao, cangcao, hucao, bingcao, facao and canjun, consistent with the ministerial structure in the imperial court. The Grand Protector was responsible for “all related placation and expedition tasks, overseeing and stabilizing the minorities, giving awards and meting out penalties, recording meritorious services, and judging matters under the jurisdiction of the Office”. It was said the Grand Protector“walked around with a yak-tail pole in his hand and lived in a residence with six flagpoles”, and “no other post outside the capital was more important than that”_.
The two Offices of Protectors of Kunling and Mengchi in the two wings of the Western Turks were under the administration of the Grand Protector, but they had a liaison management system in relation to their subordinates, which made them structurally very different from the two Offices of Grand Protectors of Anxi and Beiting. As to the titles of the leading officials, the head of the Kunling Office was called Xingxiwang Khan and Left General, Protector of Kunling; and the head of the Mengchi Office Jiwangjue Khan and Right General, Protector of Mengchi, both a combination of the title of khan and official posts of the imperial court. Moreover, at these two Offices of Protectors and their subordinate Governor’s Offices (du-du Offices), only the heads were given noble titles such as Khan, chuo or sijin and official posts such as Protector, Governor(du-du) or Civil Governor (ci-shi) by the central government. At the grass-root level, the original system of the Western Turks still prevailed. There were usually can-jiang at the Offices of Protectors and Governors (du-du) 3 dias de viaje en beijing, who were responsible for Chinese-language documents. In the Tarim Basin south of the Tianshan Mountains and to the west of the Congling Mountains, the heads of the Du-du Offices usually had both the noble titles and official posts such as Governor and Civil Governor.