This paper proposes an improved LEACH protocol method based on analysing the LEACH protocol of WSN in operating mechanism, adapting to the scene and exiting defects. At last, the emphases is proving the improved LEACH protocal method's practical operating performance by simulating with NS2 environment. The simulation results show that the improved LEACH protocol method can extend the operating life of WSN, save the limited energy of nodes, reduce the mass extinction of nodes and keep an adequate quantity nodes to operate compared to the routine LEACH protocol.