Abstract: Through the acoustic emission experiment of sandstone under uniaxial load，we reorded the AE（Acoustic Emission） signals of sandstone in various deformation phase. Obtained the curves of stress-time-ring accumulative count，stress-time-AE rates. Based on the stress -strain curve，analysed the characteristic parameters of AE in the whole failure process，Through the FFT（Fast Fourieer Transform），analysed the amplitude spectrum of 110 AE events choosed by time sequence，retained the dominant frequency of AE signals，and analysed the changes of the dominant frequency with stress. The results showed that the dominant frequency changed randomly when the stress level not more than 50% of the peak stress，subsequently，the dominant frequency had the trend to be the low frequency，what's more，the dominant frequency mainly ranged 140 kHz to 180 kHz.