By introducing the Zener-Hollomon parameter, which synthetically considers the influence of deformation temperature and strain rate into damage mechanics, a damage evolution model was developed to simulate the damage evolution of metallic materials during hot deformation. The errors between the prediction damage values and the experimental ones are within 6%. By introducing the Zener-Hollomon parameter, which synthetically considers the influence of deformation temperature and strain rate into damage mechanics, a damage evolution model was developed to simulate the damage evolution of metallic materials during hot deformation. The errors between the prediction damage values ​​and the experimental ones are within 6%.