Abstract: In order to study the sealing performance of P-type water seal in long-term service, this paper establishes a P-type viscoelastic finite element model of water seal. The evolution of mechanical and deformation characteristics of water seal during long-term service is simulated and analyzed. Firstly, based on the creep experimental data of typical rubber materials, the parameters of Burgers constitutive model and standard linear solid model to describe the creep properties of rubber materials are determined by using the least squares principle. Secondly, the creep experiment of rubber material is simulated in ANSYS, and the feasibility of viscoelastic simulation of water-sealed rubber material is verified by comparing the simulation results with the test results. The comparison results show that the Burgers model can more accurately reflect the creep phenomenon of rubber materials in the viscoelastic process than the standard linear solid model. Finally, in order to evaluate the sealing performance of the long-term service process of P-type water seals, the influence of viscoelasticity, the paper studies reservoir pressure and pre-pressure on contact stress and width of water seal by parameter analysis based on Burgers model.