Aiming at the failure problems of the main seal ring of the brake master cylinder of the electronic brake booster,such as leakage,nibbling and wear,the multi-objective optimization design of the main seal ring parameters was carried out.The primary failure modes of the seal ring were analyzed through bench testing,and in combination with user braking scenario data,simulations were conducted under typical conditions to determine optimization goals.The orthogonal test design was employed with variables including the lower-left angle of the primary sealing ring,vertex distance,rubber hardness,and friction coefficient.Using Abaqus software,a mechanical model was established to calculate key parameters such as extrusion,maximum contact stress,and wear.Finally,with sealing performance,resistance to nibbling and wear as optimization objectives,the multi-objective genetic algorithm was used to optimize the material parameters,friction coefficient and key dimensions of the sealing ring by combining the user braking scenario data.The simulation results show that the nibbling resistance and wear performance of the main seal ring are improved under the premise of ensuring the sealing effectiveness after optimization.