Abstract：Using rock mechanics test equipment RMT–150B，utilizing two different test methods—one is changing the maximum of cyclic load with the minimum of cyclic load fixed and the other is changing the minimum of cyclic load with the maximum of cyclic load fixed. The fatigue characteristics，the axial strain accumulation rule and the irreversible deformation development law and the relations betweens the axial strain rate and the cyclic numbers of times of white sandstone under the different cyclic loading conditions are studied. The results show that the macroscopic process of white sandstone fatigue failure under cyclic loading is the development of irreversible axial deformation，which finally leads to destruction of rock sample and exhibits three development phases that dont depend on cyclic loading conditions. The fatigue failure curve of white sandstone is controlled by its complete stress-strain curve under static loading. The amplitude and the maximum of cyclic load are the most important factors influencing the process of fatigue failure and fatigue lifespan of white sandstone.
