Abstract: The core of cluster-based routing protocols is cluster head (CH) selection procedure,and it allows distribution of energy consumption among each sensor node,so as to prolong the lifespan of a sensor network.In this paper, we propose a new distributed algorithm(LAECH-DS),which takes into account the distances from sensors to a base station,so it can optimally balance the energy consumption.Simulation results show that the proposed algorithm outperforms LEACH with network lifespan improved by 10%.Especially,under the condition of farther distance nodes to the base station,it has a better practical research and application value.