The main drive sealing system of shield tunneling machine is one of the key systems of the shield tunneling machine,the performance of the main drive sealing ring directly affects the performance of the shield tunneling machine.An orthogonal test scheme was established for the main structural parameters of lip seal ring which affect the sealing performance of the shield machines main drive.The finite element analysis software ABAQUS was used to establish the calculation method of opening pressure difference and contact width in the working process of main drive sealing ring of shield machine.According to the orthogonal test scheme,the opening pressure difference and the contact width were simulated,and the calculation results were analyzed by variance.The results show that the lip height and the lip thickness of the lip sealing ring have a significant effect on the opening pressure difference,the lip curvature and the lip height have significant effects on the contact width.According to the sealing requirements and analysis results,the optimal structure of the seal ring with a lip curvature of 17 mm,a lip height of 22.35 mm,a compression amount of 7.1 mm,and a lip thickness of 5 mm is obtained.After structural optimization,the opening pressure difference is reduced by 33% and the contact width is reduced by 23%.