Emperor Xuandi's reform of the capital protection house refers to the beginning of the central government's formal possession of the western regions. It is of great significance to establish capital protection governments in Han and Western Regions. First of all, western countries got rid of the cruel rule of Xiongnu and turned to the Han Dynasty with advanced production technology and relatively developed economy, thus strengthening economic, political and cultural ties with the mainland. This connection is undoubtedly beneficial to the development of local society and has a far-reaching impact on the formation and consolidation of a unified multi-ethnic country in China.

Xiongnu is a slave country, and set up "servants and commanders" in the western regions, with the purpose of extorting handmaiden and property from other countries, "preparing their rent, raising their value, and being strict with them" (Biography of Ban Yong in the Later Han Dynasty), so as to exploit and impose on people of all ethnic groups to the maximum extent. After the opening of the Western Regions in the Han Dynasty, the situation was very different. The state did not pay tribute to Han. The soldiers and officials stationed in the Western Regions in the Han Dynasty were completely provided by the wasteland and the mainland court, and were not borne by other countries.

At the same time, the agricultural irrigation technology and smelting industry in the mainland spread to the western regions, which promoted the improvement of local productivity. The unified and effective governance of the Han Dynasty provided a relatively stable living environment for the western regions, which also met the wishes of the people of all ethnic groups. Therefore, countries in the western regions "don't like Xiongnu" and "Muhan". Whenever the Han dynasty did not set up a capital guard in the western regions and the Xiongnu forces made a comeback, all countries in the western regions longed for the mainland, hoping to reopen Yumen Pass and Yangguan Pass and restore the jurisdiction of the Han dynasty.