Reverberation is the main interference in active sonar detection, due to its special properties, reverberation suppression is a difficult problem in active sonar signal processing. In this paper, the method of reverberation suppression is studied, and a new method based on the normalization of the beam space data is proposed. The basic idea of this method is to normalize the time waveform of the beam space, and then carry out the subsequent matched filtering and port-starboard discrimination. This method can reduce CFAR detection probability under reverberation background, remove the interference of own ship, and does not affect the performance of the subsequent signal processing, compared with the method of normalization after matched filtering, this algorithm has low false alarm probability and engineering practicability, Shallow sea experimental data of active towed array show that the method is effective.