Drone is widely used, with low cost, multitasking, good maneuverability, high efficiency, low radiation, widely used in various aspects of military and civil production. Since GPS has the characteristics of all-weather, high precision and automatic measurement, drones currently used for mapping are basically used to locate and navigate through GPS. The GPS single point positioning accuracy of the drone flight control is too bad. So RTK technology and PPK technologies are apllied on drone mapping, which both can reach cm accuracy.