Abstract: The ring lock type fast-opening blinds present many problems in their engineering application. In this paper, the causes for difficult opening/closing or sealing failure of door/lid systems were analyzed, and the structural principle and application of the saddle rubber sealing ring which was invented independently were illustrated. Then, comparative analysis was made on sealing performances of the saddle rubber sealing ring and the imported lip sealing ring by the ABAQUS finite element model. It is shown that the saddle rubber sealing ring is superior to the lip rubber sealing ring in all sealing performance indexes under the same operating conditions. Besides, better Mises stress distribution of the saddle rubber sealing ring has no impact on its actual service life. The saddle rubber sealing ring has been applied to domestically produced ring lock type fast-opening blind with high pressure and large diameter. This product, together with its support sealing structures, can prevent the so-called "sticking" phenomenon during the opening/closing of fast-opening blinds.