In order to study the detection performance of the network radar countermeasure system, the detection coverage of the three configuration models of the network radar countermeasure system was studied.Firstly, the network radar countermeasure system model was established.According to the basic radar equation, the boundary equation of the coverage of the network radar countermeasure system in active mode was derived, and active coverage of the three configuration models in omnidirectional search was simulated.The simulation results showed that: 1) The distance between the adjacent detection units determines the coverage boundary of the system under certain signal-to-noise ratio conditions; and 2) The coverage of the detection unit with a long separation distance is the basis for obtaining the diversity gain.Therefore, when configuring the network radar countermeasure system, it should be distributed as evenly as possible in the configuration area.The simulation results prove the feasibility of the method.