Abstract: In LEACH，the number and the locations of cluster-heads are both unstable.The improved algorithm takes remaining energy into consideration，and designs energy threshold of cluster-head during the phase of cluster-heads selection to prevent that the nodes with lower energy become cluster-heads.This phase solves the problem that the cluster-head has low power，and attains the load equilibrium and further lengthens the network lifetime.Compared with LEACH，DCHS and LEACH-H algorithm，the simulation results show that the new algorithm has better convergence.And it is more efficient to save energy of consumption and prolong the living time of the whole network.

Key words: Wireless Sensor Network（WSN）, Low Energy Adaptive Clustering Hierarchy（LEACH）, selecting cluster-heads

摘要： 针对LEACH算法存在簇头节点个数和位置分布不稳定的现象，在簇头节点的选择过程中，充分考虑簇头节点的残余能量因素，通过设定簇头的能量阈值防止低能量的节点成为簇头。改进的算法解决了LEACH簇头选择算法存在的簇头节点可能能量不足的问题，从而达到均衡网络能量消耗，延长网络寿命的目的。仿真实验采用改进算法的网络与采用LEACH、DCHS以及LEACH-H算法的网络的比较结果，说明改进算法具有更好的收敛性，实验数据表明该算法能最大限度地均衡利用网络的能量，延长无线传感器网络的寿命。

关键词: 无线传感器网络, 低能耗自适应分簇分层算法（LEACH）, 簇头选择