Abstract: The elastic-plastic deformation behaviors of magnesium alloy coronary stent were studied by finite element method, and the variation of equivalent stress in the stent with the displacement of expansion loading was obtained. The influences of residual deformation and residual stress of the stent after springback on its dynamic characteristics were analyzed. Modal analysis and harmonic response analysis were employed to calculate the first five natural frequencies of the stent, corresponding vibration modes and displacement response under harmonic excitation. The results show that the first five natural frequencies of the implanted stent are significantly reduced due to the large structural deformation after expansion and springback, while the residual stress has little influence on the natural frequencies and vibration modes of the stent. When vascular constraints were considered, the first four order natural frequencies of stents changed, but the vibration modes were not. The stent is more prone to bending deformation than torsion and breathing deformation. These analysis results can provide reference for the optimal design in strength and stiffness of stents.