Within the framework of the China Accelerator Driven Sub-critical System (CADS) project, institute of modern physics (IMP) has proposed a 162.5MHz half-wave resonator (HWR) Superconducting cavity for low energy section (β=0.09) of high power proton linear accelerators. For the geometrical design of superconducting cavities structure mechanical simulations are essential to predict mechanical eigenmodes and the deformation of the cavity walls due to bath pressure effects and the cavity cooldown. Additionally, tuning analysis has been investigated to control the frequency against microphonics and Lorentz force detuning. Therefore, several RF, static structure, thermal and modal analyses with threedimensional code Traditional ANSYS have been performed [1]. In this paper, we will present some results about mechanical analysis of the first superconducting HWR cavity in order to further optimization in the near future.