Abstract: One of the biggest challenges is to prolong the lifetime of Wireless Sensor Networks（WSNs） for designing and deploying WSNs.Since the nodes energy is limited，nodes usually transmit data to the base station by multi-hop.This paper analyses energy consumption in WSNs to propose a non-uniform deployment strategy，which obtains a density function to deploy sensor nodes and deploys more nodes in area closer to the base station.Simulation results show that the strategy is effective for prolonging the network lifetime.

Key words: wireless sensor networks, node deployment, lifetime

摘要： 尽可能延长无线传感器网络的生命周期是设计和部署网络所面临的最大挑战之一。由于节点配备的能量有限，节点通常采用多跳方式向基站传输数据。分析了节点在多跳通信时的能耗，提出一种非均匀的节点部署策略，得出一个部署传感器节点的密度函数，在靠近基站的区域部署较多的节点。仿真实验表明，非均匀的节点部署策略能有效延长网络的生命周期。

关键词: 无线传感器网络, 节点部署, 生命周期