Taking the large-scale high hydraulic support column combined bud seal ring as the research object,the influence of the structural parameters such as the lip inclination,camber angle and lip valley height on the static sealing performance of the combined bud seals was analyzed.The influence of the hydraulic pressure,seal gap,piston speed,and friction coefficient on the dynamic sealing performance of seal ring was studied.The results show that,in a certain value range,the larger the inside and outside inclination of the lip and the lip groove size,the better the static sealing performance,and the greater the oil pressure and the smaller the seal clearance,the better the dynamic sealing performance.The greater the friction coefficient,the better the dynamic sealing performance for the outer stroke,but the opposite for the inner stroke.The piston speed has little influence on the dynamic sealing performance.In order to ensure the good comprehensive sealing performance of the combined Leishaped sealing ring studied in this paper,the optimization range of each parameter is as follows:the outside inclination of the lip from 20° to 30°,the inner inclination from 20° to 35°,the valley heigh from 12.2 mm to 13.2 mm,the friction coefficient less than or equal to 0.1,the sealing gap from 0.1 mm to 0.3 mm,and the oil pressure no more than 50 MPa