Abstract: The application of postprocessed kinematic (PPK) technology in traditional unmanned aerial vehicle (UAV) requires temporary erection of ground base stations, which increases the workload of the field. The DJI Phantom 4 real time kinematic (RTK) UAV is used as the research object, the data of continuously operating reference stations (CORS) and ground base stations at different distances are used to participate in UAV PPK technology, and the processing results will be compared with UAV RTK. The results show that the relative results of CORS station are significantly affected by distance. When close to the experimental area, the accuracy of CORS base station is slightly lower than the results of base station and RTK erection in the experimental area, and can meet the requirements of 1∶1 000 scale mapping. This result is of certain significance to reduce the field work intensity and the field work flow.