The mechanical characteristics of packer sealing rubber are complex in downhole application,and it needs to withstand the strong corrosion effect of high temperature and high pressure saturated water vapor,which makes the material performances of the packer rubber extremely demanding.In order to improve the structural stability and he high temperature and high pressure water corrosion of sealing rubber,the finite element simulation analysis of the packer rubber was carried out.By comparing the influences of structure parameters,interface friction performance and material properties on its mechanical properties and sealing property,the multilayer stack of the hard soft materials and ring end chamfering metal cladding structure were presented to realize the performance optimization.The simulation results show that the optimized structure improves the packer rubber extrusion phenomenon of the shoulders,increases the sealing effect of the contact area,and prevents the high temperature and high pressure water corrosion for the packer rubber.