Against the circumstances of Chuanxia, Jinghu and Guangxi prefectures in the Song Dynasty, the demarcation of regions and citizenship by the Song Court differed from other dynasties by one of its important bases on the demarcation of Shengdi. On the one hand, there have already been numerous research results in the academic circle about the study of the minority policy, Jimi area, etc. at the southwest frontier in the Song Dynasty; one the other hand, there have been no specialized researches on the demarcation of Shengdi and its subsequent relative policies till now. This paper classifies and analyzes the following issues: (a) the wording of Shengdi in the Song, as a special regional geographical concept, refers to the area under a stable jurisdiction by the Song Court’s prefecture or county. Shengdi was hardly applied to the large scale inner areas or to the borderland area with Liao, Xia and Jin. In contrast, it was usually applied to the area in the southwest frontier, like Chuanxia, Jinghu, and West Guangnan, differentiated from Jimi prefecture or county, and minority densely settled area. (b) The civilians in Shengdi mainly included the Han household and the Shu household. Shu payed tax as Han did, with the tax varying in certain areas. Both Shu and Han were accordingly administrated by its superior prefecture and county. Outside Shengdi, “Shu household” in related Jimi prefecture or tribe payed “Liangna”, i.e. symbolically paying tax or tribute so as to be subordinate to its superior prefecture or county. Some Shu household payed “dual tax” to the Song Court and its own tribe, so as to be “a dual household.” Outside Shengdi, the tribe areas with appointed economic relationship were defined as the Sheng boundary and the Sheng household. Since the expansion of boundary in the mid Northern Song Dynasty, many changed into Shengdi and Shu household. (c) The early Song Dynasty saw a development of 300 Jimi prefectures. They formed an “affiliation” with the Song governments through “paying tax or tribute”. The Jimi prefectures, where there lived the Sheng household and the Shu household, were administrated by “Shengdi”, its superior prefecture or county; in other words, Jimi prefecture did not belong to “Shengdi.” The stability in the frontier along Jimi prefecture lay a foundation for mutual exchange and trade. It was also important for the Song’s control over Jimi prefecture. In the Southern Song Dynasty, Jimi prefectures were much reduced in scale and number. However, in areas with Jimi system, the frontier distinction and policies were conducted as before. (d) Nevertheless, Shengdi in the frontier along Guangxi Prefecture was differently demarcated: the Qiyuan Prefecture, Guihua Prefecture and Shunan Prefecture (part of ancient Vietnam) were considered to be within the Song’s “Shengdi” domain, and accordingly, people living there were considered as “Shengmin.” The stable Jimi prefecture system ran through the Northern Song to the Southern Song Dynasty with nearly no change at all. The demarcation of Shengdi in the Song Dynasty served as a benchmark to differentiate areas and households in the frontier, and it was an important base for the application of diversified policies as well.