Abstract: Aiming at the problem of long residual duration of the existing sonar transmitter, the cause of generating residual vibration and the methods of attenuating the residual vibration time are analyzed, and the effectiveness of these methods is verified by experiments. Starting from the actual demand, three methods to reduce the aftershock duration of sonar transmitter are studied by combing energy attenuation theory and corresponding experiments. The results show that the three methods can all reduce the aftershock duration of sonar transmitter to a certain extent, and provide an effective method to reduce the test blind area of ADCP, so as to further improve the test performance of ADCP.