This paper applies a new modified Synthesized algorithm based on the Centroid and PDM Localization Synthesized existence of high node location error and energy consumption higher shortcomings. The algorithm not only reduces the positioning error of additional nodes, but also greatly reduce the energy consumption. Through NS-2 simulation software on the node to locate the error simulation, results show that the optimized algorithm of positioning error rate is reduced than before. And more of anchor nodes create more accurate positioning. The result of the simulation experiment shows that the optimized algorithm is stable and easy to implement and improve the positioning error and energy consumption level. It achieves the required goals.