Abstract: In order to verify the validity for signal phase matching principle, the experiments of DOA (Direction of Arrival) estimation are carried out at reservoir by using 16-sensor array. The performance of direction estimation by using signal phase matching principle was analyzed and compared with that by using MUSIC and Conventional Beamforming Methods (CBF). The results show that the DOA estimation performance was better than that obtained by MUSIC and CBF methods, and that the 3 dB beam width obtained by Least Squares Method for Signal Phase Matching principle (LSMSPM) and Singular Value Decomposition for Signal Phase Matching principle (SVDSPM) is 1/4~1/7 as much as that obtained by CBF and 1/2~1/3 by MUSIC methods and the LSMSPM and SVDSPM are available for DOA estimation of multi-sources and for the super-resolution DOA estimation.