Abstract: In order to reduce the size of traditional pressure-sensor array and to improve measuring precision,2-D DOA is estimated by array signal processing theory taking advantages of characteristics of vector hydrophone.A single vector hydrophone can be regarded as an array consisting of a pressure hydrophone and three velocity hydrophones.In this paper,2-D DOAs of several uncorrelated narrow-band signals are estimated by using MUSIC and ESPRIT algorithms without prior information.Simulations show that precisions of the two algorithms are very good under high SNR and better than that of 5-element pressure-sensor parallel-linear array.By using a single vector hydrophone,two-dimensional direction-of-arrival can be estimated effectively,and its size is much smaller than that of traditional pressure-sensor ar-rays.