Abstract: In recent years，as the development of wireless sensor network，people do some deep researches on cluster-based protocol，most around the prolongation of the lifetime of WSN and decline of energy consumed by the sensors.This paper analyses the cluster-heads generated arithmetic among LEACH and presents improved approach，adjusts the node’s threshold function chose to be cluster-head and considers comprehensive node’s residual energy and distance to base-station.Then their performance is compared.The simulation results show that the new strategy of cluster-heads election achieves great advance in sensor and network’s life-time.

Key words: Wireless Sensor Networks（WSN）, Modified-Low Energy Adaptive Clustering Hierarchy（M-LEACH）, cluster-head selection, load balancing, fitting factor

摘要： 延长传感器网络的生存周期，降低传感器节点的能耗成为无线传感器网络（WSN）研究的重点。基于LEACH 协议中簇头生成算法提出了改进、调整节点竞选簇头的阀值函数，并在非簇头节点选择适合自己的最优簇头时综合考虑了候选簇头节点的剩余能量以及距基站的距离等因素，给出了新的成簇机制的适合因子的计算公式。仿真结果表明，新型簇首选择机制能够有效平衡节点的能耗分布，延长节点与网络的寿命。

关键词: 无线传感器网络, 改进的低功耗自适应集簇分层型协议, 簇头选择, 负载均衡, 适合因子