Aiming at the problem of poor sealing effect caused by the damage and leakage of the pressurized water seal of the lower head work gate for Three Gorges ship lift,this paper establishes the model of pressurized water seal using the finite element analysis software ABAQUS,and analyzes the influence of different sealing rubber materials on the free extension of seal head,tightness of back cavity,water tightness of seal head,head offset and friction resistance of seal head when the height of seal head is increased.The results show that the contact stress,normal stress and maximum offset of the pressurized water seal head all decrease with the decrease of the hardness of the rubber material.The lower the water head,the higher the sensitivity of the material hardness.Both the contact stress and normal pressure increase with the increase of the height of the wing head.Finally,the method of optimizing the pressurized seal rubber material is proposed to improve the effect and service life of pressurized water seal.