Different size ring structure parameters selection is different. By simulating the pressure distribution, the three main parameter selection trend was discussed. In order to further improve the sealing performance of upstream pumping spiral groove, the structure of the spiral groove was optimized, the reservoir and dam area were unchanged, only the bottom shape of the spiral groove and the spiral groove shape were changed, such as equaldeep spiral groove was changed into convergent deepening groove. The results show that the convergent taper unequal groove has the best sealing performance. On this basis, the influence of the structural parameters on the sealing performance of convergent taper unequal groove was studied