Abstract: In the acoustic target recognition,the auditory feature's advantages compared with the traditional feature are studied by using the cascade compressive gammachrip (CcGC) filter model,which has been used to describe auditory system function.It is concluded from theoretical analysis and simulations that the auditory feature has better effects as the Signal-to-Noise Ratio (SNR) is reduced.At last,the mechanism of noise suppression in cochlea is analyzed by simulations,and it is shown that Equivalent Rectangular Bandwidth (ERB) expression in frequency domain and the compression of cochlea are essential for cochlea noise suppression.