In wireless sensor networks（ WSNs）

jammers are distributed to emit interfere signals and block the network communication

which cause severe damage to the WSNs. Once jamming attack occurs

the most urgent work is to get the position information of the jammer. Localization of jammer is conducted by geometric covering methods. And a compensating measure utilizing power of jamming signal received by boundary nodes is composed to reduce the estimated error of the jamming area. Utilizing the network topology structure

the localization method can be conducted without additional hardware equipments. Simulation results show that higher localization precision under different network conditions can be achieved by this localization algorithm and has higher stability.