The intelligibility, the definition and the Comfort for digital hearing aids were reduced because of distorting formant of speech resulted by the existing loudness compensation method(LCM). In order to solve these problems, a LCM based on human auditory is proposed in this paper. This method adopts gammatone filter banks which can simulate the auditory model of human ear cochlea. Input signal is divided into 32 frequency bands by the filter banks. And then signal of each frequency band is compressed or amplified in accordance with the curve of hearing impaired. Experimental results show that the performance of the proposed method is better than the multichannel LCM based on Bark filters.