There was a certain degree of administrative relations between the protectorate of the Western Regions and the Kingdoms in the Western Regions. The number of households in the Western Regions, as seen in Han-Shu-Xi-Yu-Zhuan(漢書西域傳), probably be known and recorded by Han Dynasty through this way. The household surveys were conducted by the Cao(曹) of the Mufu(幕府), which is subordinated to the protectorate, and its main purpose was to understand the basic situation of the Western Regions, instead of the need for taxes. The phenomenon that the number of households is uneven, was probably caused by several factors: the political relations between the Han Dynasty and each Kingdom, the degree of completeness of household registration in each Kingdom, etc. This paper also discusses the evolution of Wu-Ji-Xiao-Wei's(戊己校尉) organization, and points out that it had gone through three stages of changes during the Western Han to the Xin Dynasty: (1) Wu-Xiao-Wei(戊校尉) and Ji-Xiao-Wei(己校尉) were separated, and they both had two Bu(部) and ten Qu(曲). (2) Wu-Xiao-Wei(戊校尉) and Ji-Xiao-Wei(己校尉) were separated, and they both had one Bu(部) and five Qu(曲). (3) Similar to (2), however, it was more frequent that Wu-Xiao-Wei(戊校尉) also undertook the position of Ji-Xiao-Wei(己校尉), and vice versa. In this paper, we propose a viewpoint that "Wu-Ji-Xiao-Wei(戊己校尉)", as a formal officer, didn't exist in the Western Han and the Xin Dynasty. The three specific "Wu-Ji-Xiao-Wei(戊己校尉)" that we can see in Han-Shu(漢書) were the abbreviation of Situation (3).