Abstract: In the location of Wireless Sensor Networks (WSNs),positioning accuracy is a key factor in sensor nodes.In this paper,a distance estimation and correction algorithm is proposed.The distance estimation and preprocessing of the nodes are realized by the combination optimization method of hop weighting and averaging per hop distance error correction.Then the L-M algorithm is used to calculate the position of nodes.In this paper,compared with IDV-Hop and TWDV-Hop algorithm,the optimization algorithm has a great improvement in the accuracy of positioning accuracy,which is based on the simulation of different node size,anchor node ratio and node communication radius.