According to the finite element calculation software ABAQUS, the stress, displacement and slope stability of earth-rock dam were calculated under certain conditions. The stress, displacement, the most dangerous sliding surface and the safety factor of the dam body are obtained through the calculation and analysis of the hypothetical engineering example. The numerical simulation results show that the plastic variation process of earth-rock dam is in good agreement with the actual engineering plastic variation process. Therefore, the finite element strength reduction method is practical and reliable to evaluate and analyze the final state stability of slope of earth-rock dam slope and other similar engineering.