The paper performs the risk analysis of potential cybersecurity problems in residential consumer unmanned aerial vehicles (UAVs) adopted by power utilities for the transmission line inspection. Considering the realtime requirement, unstable communication links, easytotamper GPS navigation signal, and flight path confidentiality, the paper shows the cybersecurity matters in applying professional UAVs for the transmission line inspection. After that, the paper proposes the evaluation and screening method in UAVs and ground control systems for falsified GPS signals, which is based on the symmetric encryption control signal, encrypted communication and storage of aerial data, key distribution mechanism, and inertial guidance system in UAVs. Moreover, the cloud security malwaredetectionbased reinforcement measure is also proposed. The proposed method and measure ensure the cybersecurity of professional patrol UAVs.