Taking the bolt pretightening rubber seal structure at the engine water outlet as an example,the finite element models of rubber sealing ring with threehole and fourhole bolt assembly structures were established respectively.The sealing performance and stress state of the rubber sealing rings with different assembly structures under different temperature conditions were analyzed by using FEA software ABAQUS.The results show that the von Mises stress,contact stress,maximum true strain and contact width of the sealing rings with threehole and fourhole bolt assembly structures increase with the increase of temperature.Under different working conditions,there is little difference in sealing performance for the sealing rings with threehole and fourhole bolt assembly structures,and all meet the sealing requirements.However the sealing ring with threehole assembly structure has smaller von Mises stress,which is beneficial to improve the service life of the seal ring.