Abstract: In order to obtain the characteristics of infrasound signal during the deformation process of the granite，the laboratory experiments of medium-fine monzonitic granite under uniaxial compression were carried out to study the characteristics of ringing counts and energy rate during the deformation process of the rock. The variation characteristics of cumulative ringing counts in different stress levels are analyzed. And the fractal dimension characteristics of infrasound energy rate are studied. The results show that the ringing counts and energy rate of granite infrasound increase suddenly before stress peak appears. The cumulative ringing counts of infrasound tend to be stable at the relative stress level less than 70% of peak stress， and the cumulative ringing counts increased significantly as stress level exceeds 70% of peak stress. The energy rate of infrasound signal has obvious fractal characteristics. The fractal dimension of energy rate decreases to the minimum when the relative stress level ranges from 87% to 96%， as a precursory characteristics of rock fracture.

Key words: Granite, Infrasound signal, Ringing count, Energy rate, Fractal dimension