Abstract: There are three absorptivity models,i.e.the single constant absorptivity model,assembled constant absorptivity model whose liquid-state and solid-state absorptivity are both constant and temperature-dependent absorptivity models.In order to compare the influences of the three models on the numerical results,a spatial axis-symmetric finite element calculation model was established based on the three absorptivity models respectively.The laser heating process of an aluminum plate was simulated and the three numerical results were compared.The advantages and disadvantages and the application scope of the three absorptivity models were discussed.The results show that for the heating process of both solid state and liquid state existing evidently,the computed results based on the assembled constant absorptivity model are similar with those based on the temperature-dependent model.However,for the heating process of only one single physical state existing,the computed results based on the constant absorptivity model are a little different with those based on the temperature-dependent model.