Abstract: The material model for shape memory alloys was tested and verified by Ansys firstly.Then two nitinol stents' anti-compression properties were stimulated and tested.The results show that simulations for two nitinol stents conform to those of the experiments,that indicates finite element method（FEM） can be employed in stent testing to some extent.Finally the influence of the stents' dimension on the stent's resistance to compression is systematically analyzed.The results show that the stent’s radial strength is improved with the increasing of the strut’s width or thickness,and their influences are almost equivalent.