Sintering process has great influence on the performance of porous materials. In order to obtain the best mechanical properties and required parts shape, it is necessary to study the thermal deformation evolution of sintering. Based on coupled thermo-mechanical SVOS visco-plastic constitutive model the macro deformation of porous materials was calculated about the sintering process of stainless steel porous materials. The parameters of sintering stress, shear viscosity and volume modulus were fitted by using fourth-order Gauss functions base on free sintering and bending experiments. The relative density, linear shrinkage rate changing with the sintering time and temperature were discussed. The results show that the simulated process is consistent with the experiments that validate the rationality of the model. The difference of linear contraction curves under different heating rate of material is very little. Therefore, heating rate has small influence on sintering process. When the heating rate is slow or fast, computations are not easy to converge, and the calculation time is longer. The sintering simulations of the green parts prepared by dry-press process shows that the initial density distribution inhomogeneity causes eventually density distribution inhomogeneity, while the range of density is not big.