Abstract: A key obstacle to high accuracy location is the Non Line Of Sight（NLOS） transmission of signal in wireless sensor network node localization.NLOS error is the main source of location error.This paper proposes a new residual weighting location algorithm based on analysis of existing NLOS error mitigation techniques.This algorithm gradually reduces the number of range measurements from the combinations，picking out the combinations of range measurements with the minimum residual at every step and then calculating the weighted mean.In addition，it uses improved LS method to compute the temporary coordinates.Simulation results show that it has quite well location accuracy and is robust to different NLOS error.