This article is to identify the difference from the previous ones through structure and work of ZongZheng-si(宗正寺), and to study the characteristics of the officials' management process. In the past dynasty, there was a ZongZheng-si which had been in charge of the management of Royal Family, and so did Tang dynasty. Since Kaiyuan 25^th year(737), the number of subordinated offices of ZongZheng-si in Tang dynasty has gradually increased, which has brought about a great change in the scale and status of the government. During the reign of Emperor Xuanzong of Tang, the works of ZongZheng-si were not only extended to the Royal Ancestral Shrine, Emperors Tombs, and princes graves and princes shrine but also maintained to the Daoist temple and ascetics of the ChongXuan-shu(崇玄署). Tangliudian, Tongdian, Tanghuiyao, Jiutangshu, Xintangshu were partially documented or omitted, making it difficult to grasp the entire structure at the end. Therefore, this study systematically drew the structure by comparing and analyzing the movement of subordinated offices. The fact that the main task of ZongZheng-si was the management of the Royal family without exception until the Tang dynasty, tending to fix the character of the government officials. The characteristics of the government officials were also analyzed by considering that there might be a difference in staff management according to the difference in the operation of the subordinated offices. First, there was a higher percentage of ministers and vice-minister of who did not have a genealogy until at least the first half of Tang dynasty, however after the Kaiyuan 20^th year(732) rule promulgated that all government officials of ZongZheng-si should be Royal family, the ministers and vice-ministers proportion of those who had a genealogy began to increase toward the end of the Xuanzong reign. The secondly is that the officials who manages the prince's graves raised the status of the princes. Thirdly, the test was conducted in the ZongZheng-si for bureaucracy so that the Royal family could get a benefit in entering government service. The expansion of the operation of six subordinated offices was carried out with the aim of improving the imperial status. In addition, the fact that it was differentiated from other government officials was a part of keeping the emperor's power base stable by recognizing benefit to the Royal family.