关键词：无线传感器网络；能耗；两级层次
摘 要：Energy scarcity is one of the most critical problems that occur in wireless sensor networks compared to traditional networks.However,the problem has been partly solved by building the power consumption model of WSN.This paper is based on a simple wireless sensor network model,it gives the optimal location of the CH nodes in a cluster and the best parameter about how to divided the cluster amongst hierarchy networks.As shown last,the proposed scheme can save up to 95％ of power consumption.