In order to compare the mechanical properties of elastic metallic sealing rings with different structures,the numerical model of mechanical characteristics of elastic metallic sealing rings was established.On the basis of verifying the accuracy of the numerical model,the deformation characteristics,axial stiffness and resilient performance of O-ring,C-ring,U-ring and W-ring were compared.The influence of inlet-outlet pressure difference,temperature and structure style on axial stiffness was analyzed.The results show that under the compression-reset conditions,U-ring and W-ring have good resilient performance,C-ring has moderate resilient performance,and O-ring has poor resilient performance.Under the high temperature and high pressure conditions,the axial stiffness of elastic metallic sealing ring is decreased with the increase of temperature,while the inlet-outlet pressure difference has little influence on the axial stiffness of elastic metallic sealing ring,and the axial stiffness of the four structures are O-ring,C-ring,W-ring and U-ring in descending order.Compared with the compression-reset condition,the maximum stress value of the elastic metallic sealing ring is smaller under high temperature and high pressure with the same amount of compression,but the area where the stress value exceeds the yield strength is larger,so the structure is more prone to failure.By comparing the four structures,it can be found that O-ring is suitable for high load and low resilient condition,U-ring and the W-ring are suitable for low load and high resilient condition,and C-ring has moderate performance.