A chaos particle swarm optimization（CPSO） node positioning algorithm for wireless sensor networks（WSNs） is proposed

in order to reduce ranging error of ranging method of received signal strength indicator（RSSI）.Positioning sequence is selected according to reliance degree of unlocalized node

and the unlocalized node position is estimated by using particle swarm optimization（PSO） algorithm

according to ranging distance

the PSO premature convergence is avoided by adopting chaos disturbance mechanism and start-up of disturbance mechanism is lie on premature detection result.Experimental result shows that the algorithm can not only improve localization precision

at the same time

effectively solve problem of the particle swarm optimization premature convergence.