Abstract: This paper mainly discusses the positioning model of the combination system of Beidou and GPS, through the dynamic positioning experiments were carried out in different receiving environment, using carrier phase postprocessing technique for dynamic data processing, combined with the spatial distribution and location of environmental satellite, analyzed the single Beidou Satellite Navigation System, Global Positioning System, and positioning system performance. The results show that the observation conditions favorable environment, the positioning performance of combination system and global positioning system is basically the same, the Beidou Satellite Navigation System in the weaker; observation condition is not ideal environment, increase the number of visible satellites navigation system, improved satellite constellation structure, improve the positioning performance, the dynamic positioning performance is superior to that of the dynamic positioning performance the combination system of single system.