Abstract: In view of the current BDS-2/BDS-3 integrated positioning performance, this paper analyzes the impact of different types of BDS-2 satellites on the accuracy of B1I, B3I, B1I/B3I pseudo range single point positioning accuracy of BDS-2/BDS-3 tracking station. It is found that different types of BDS-2 constellation satellites can effectively improve the visibility and geometry of BDS-3 satellite. GEO IGSO and MEO can improve BDS-3 single frequency and dual frequency pseudo range single point positioning accuracy within 20%, while all BDS-2 satellites can improve BDS-3 single frequency and dual frequency pseudo range single point positioning accuracy within 30%. The overall improvement relationship is all BDS-2 satellites > IGSO > GEO > MEO.