Aiming at the problems of fast energy consumption rate，short network life cycle and weakcommunication capability of nodes in LEACH，a modified LEACH protocol ( MOD-LEACH) with high energyefficiency was proposed. Firstly，the remaining energy of the node，the number of neighbors and the distancebetween the node and the base station are taken into full consideration to calculate the true probability of the nodeas the cluster head，so as to optimize the voting threshold of cluster heads. Secondly，the nodes calculate the costfunction according to the energy of the cluster head，the number of neighbors and the distance between them，so asto judge the cluster head scientifically. Finally，the cluster head communicates with the base station through singlehopor multi-hop mode according to the distance between the cluster head and the base station，so as to reduce theenergy consumption of the cluster head. Simulation results show that the performance of MOD-LEACH protocol isbetter than the existing protocols. Compared with LEACH，DEEC and H-LEACH，the network life cycle of thisprotocol is extended by 61%，42. 6% and 14. 2% respectively. At the same time，the amount of data received bythe base station in MOD-LEACH protocol is also greatly improved compared with the other three protocols.