Abstract:Deformation rules and acoustic emission characteristics of rocks in the process of fatigue failure are studied and the relation of them is revealed using the rock mechanics test equipment named RMT-150B and Locan320 acoustic emission instrument. The elementary analysis for the process of fatigue failure of rock is carried out from the points of macroscopical irreversible deformation and microcosmic damage. In addition,three-stage laws of axial deformation and two-stage laws of radial deformation are established and the rationality to choose axial deformation as macroscopical damage parameter is also presented.