In a practical combat case, a small drone quietly approached from the southwest direction of the nuclear power plant. The system detected it at the first time and quickly launched the countermeasure procedure. The drone lost control at a distance of about 1.5 kilometers from the nuclear power plant. After circling in the air for several times, it slowly flew away from the nuclear power plant and finally landed in an open wasteland. The whole process was efficient and safe, and did not have any impact on the normal operation of the nuclear power plant. In addition, this fixed UAV countermeasure system also has a self-diagnosis and early warning function. Once a certain device in the system fails or malfunctions, it will immediately send detailed failure information to maintenance personnel to ensure the continuous and stable operation of the system. Meanwhile, it can also achieve seamless docking with the existing security monitoring system of the nuclear power plant, realize information sharing and coordinated operations, and further enhance the overall security protection ability of the nuclear power plant. The successful application of this fixed UAV countermeasure system has provided a reliable solution for the airspace security protection of nuclear power plants and other similar high-sensitivity and high-risk facilities. It has also set a good example for the in-depth application of UAV countermeasure technology in special fields, promoting the industry to continuously explore and improve security protection strategies for critical infrastructure.