Due to the disequilibrium of the channels in the array，it is difficult to achieve the expected performance such as target-detecting and orientation-estimating during the beamforming of acoustic receiving system. In this paper，the mechanism of signal-to-noise ratio，amplitude and phase of each channel affecting the beam signal-to-noise ratio is analyzed，a method to reduce the disequilibrium of the channels in the array is proposed，and the measured data is used for simulation. Simulation results show that this method can effectively improve the target-detecting and orientation-estimating performance of acoustic receiving system.
