Abstract: In order to achieve the accurate location of the target localization algorithm using a guide source(GTL algo-rithm) in low signal-to-noise(SNR) ratio condition,a denoising processing method for the GTL algorithm based on the field average method is proposed.Some guide sources and objective sources with different SNRs are used for the GTL algorithm simulation,and the simulation results before-and-after denoising processing are analyzed.The analytic results show that the location efficiency of the GTL algorithm is improved by the denoising processing of using the field average method.