Abstract: Position and orientation system (POS) can acquire the line and angle elements of the aerial photographs directly, which can reduce the workload of unmanned aerial vehicle photogrammetry and improve work efficiency, thus the UAV photogrammetry has become an important way of data acquisition in aerial photogrammetry. For the large quality of conventional RTK products, it is difficult to be applied in the UAV surveying. In this paper, Doppler smoothing algorithm has been adopted to refine code observables, and then the combined Doppler-smoothed code (DSC) and phase data have been used to realize UAV post processed kinematic positioning (PPK). The results of measured data have shown that,compared with single satellite system, the combined GPS／BDS system can meet the requirement of kinematic positioning for UAV photogrammetry, and the efficiency and reliability of PPK positioning can be improved based on the DSC and phase observables.