In the aftermath of the victory, the Tang government set up four military garrison commands in the Western Regions, Sulek(also known as Shule), Qiuci, Yutian and Yanqi (changed to Suiye, or Suyab, between 679 AD and 719 AD), which were all under the control of the Protector of Anxi.
Historically, they were known as the“Four Garrison Commands of Anxi”. The installation of the Office of Protector of Anxi and the Four Garrison Commands of Anxi was an important step in the Tang Dynasty’s rule over the Western Regions, In terms of post installation, while inheriting governance strategies of previous dynasties, the Tang government invented some new measures in its administration in the Western Regions, which can be summed up as follows:
(1) Continued combination of military and administrative functions in the governance system. Since its creation in the Han Dynasty, the Protector system combining military and administrative
functions was picked up by all the following dynasties, which produced rather good results. This showed that this governance system was basically compliant with the economic and social development in the Western Regions at that time.
(2) Parallel application of “hard” and “soft” policies in the means of governance. That method started during the early days of the Tang Dynasty. The military garrison commands were mainly responsible for stationing troops and defending territory; while the Office of the Protector was in charge of comforting and placation.
(3) Integration of the Han people and minorities in the governance structure. Troops in the four garrison commands were a mixture of the Han and minorities, while the officers and generals were also ethnically diversified.
(4) Focus on the western and southern frontiers of the Western Regions in the governance layout. All the previous central governments that had administered the Western Regions starting from the Han Dynasty tended to focus on the middle areas such as Yanqi and Qiuci when they were strong in power; and the east such as Yiwu, Gaochang and Shanshan when they were weak. The Four Garrison Commands Chinesische mauer peking of Anxi of the Tang Dynasty were all located in the key frontier areas in the west and south of the Western Regions, with Suiye penetrating deep into the west, bordering on Central Asia. Therefore, the establishment of the four garrison commands greatly extended the scope under direct control of the Tang Dynasty.
All in all, the Office of Protector of Anxi and the Four Garrison Commands of Anxi marked the commencement of a new historical era in the governance of the Western Regions by the central kingdoms.