A clustered reconnaissance and defense system is designed,which can be used in military reconnaissance and civil disaster relief detection.The cubic unit is the core of the system hardware.The subsystems including fixed-wing UAV(unmanned aerial vehicle),four-rotor UAV and UAV are integrated in the cubic unit system.The working background is set,and the function and the working flow of the system are designed.A four-level communication network is designed to realize the information exchanges between UAV subsystems,collaborative communications between cubic unit systems,and information exchanges with remote command center.To realize the detection and defense tasks,a three-level command and control network is designed to implement intelligent collaborative management of tasks,data processing,and task execution control.The system can realize the function of detection and the function of regional communication relay,which can play an important role in both civil disaster relief and military war area detection and defense.