Abstract: The roll-over protective structures (ROPS) must have enough lateral rigidity to prevent deformation and assimilate a little energy when vehicle rolls over. The finite element model of a mining dump truck roller safety-cab ROPS was established using the elasticity and plasticity theories and the nonlinear finite element method. Lateral, vertical and longitudinal load forces were loaded to the model step-by-step. The results indicated that the end of top transverse beam ROPS had been the stage of plasticity mechanism deformation, then energy absorption had achieved the international requirement , and the ROPS structural component did not trespass into deflection-limiting volume (DLV).