A kind of lens type seal was designed,which was applicable to the locking mechanism of the connector of 3048 mm pipes that worked in the condition of 1 500 m depth of water,oil and gas pressure of 345 MPa.The seal is composed of double seals,the lens seal and O ring,which is easy to keep in the same center line,can reduce the axial pre tightening force of the hub flange of (to reduce the size of the hub flange),and has a certain ability to temperature compensation and is adapted to U level( 18 ℃ to 121 ℃) temperature of working environment.The sealing test scheme was designed through the gap between double seals.The real model of the seal was established and the finite element analysis was carried out to evaluate the sealing effect.The feasibility of the lens type seal is verified,which provides an important theoretical basis for the prototype design.