Abstract: Prolonging the network lifetime is the most important objectives in wireless sensor networks（WSNs）.The sink mobility
is employed recently for the save of sensor energy.Recent researches show the network lifetime can be significantly extended
if the energy consumption can be balanced.In this paper，a clustering algorithm with balanced energy consumption is
presented firstly，which keeps the total energy consumption in a low level based on the sensor location information.Then a
sink mobility scheme is proposed，which navigates the mobile sink to traverse through the cluster centers which has the highest
residual energy.Simulation results demonstrate that the proposed scheme can provide longer lifetime as compared to the
conventional method called random waypoint mobility（RM）.