Abstract: This paper introduces an algorithm for target location using three receiver hydrophones.The Hough transform is used to extract the closest point of approach Closest Point of Approach（CPA） of the target trajectory from Low Frequency Analysis and Recording（LOFAR） spectra received by hydrophones.According to the closest point association algorithm proposed in this paper,the moving speed of the target can be determined,and the distance between the target and each hydrophone can be calculated,so that the target can be located by combining the principle of three-side positioning.Simulation and sea trial data processing results show that the proposed method can locate the target with uniform velocity in the absence of environmental parameters.