The axial stiffness of metallic Wring and the sealing effect are closely related,and choosing suitable axial stiffness of Wring is the foundation of optimization of system structure and parameters.The axial stiffness of Wring was calculated by using ANSYS software,and the effect of structure parameters (as wall thickness,wave height,radius of wave trough,radius of wave peak and diameter of sealing ring),layers and temperature on the axial stiffness of metallic Wring was researched.The results show that the axial stiffness of metallic Wring is inversely proportional to wave height,radius of wave trough,radius of wave peak,layers and temperature,and is proportional to wall thickness and diameter of sealing ring.The wall thickness and wave height have a great effect on the axial stiffness of metallic Wring,so the wall thickness and wave height should be taken into account in the metallic Wring design.Compared to single layer structure,multilayer structure metallic Wring has better compensation performance,multilayer structure metallic Wring should be selected to satisfy high compensation requirement.The axial stiffness of metallic Wring is inversely proportional to temperature,the strength of metallic Wring should be considered in the high temperature situation.