In order to achieve pseudo-satellites at any time and place can be accurate and reliable positioning of the target, this paper discusses one of the key techniques affecting the accuracy of positioning-the research on configuration. It analyzes the basic concept of pseudo-satellite and pseudo-satellite positioning system, discusses three elements which affect the configuration: the principle of positioning, line of sight range, the dilution of precision (GDOP). The results show that GDOP is inversely proportional to the tetrahedron volume posed by the observed pseudo-satellites.