The material stressstrain curve of foamed silicone rubber was obtained by mechanical properties test.Combined with the Ogden (Foam) 3rd-order hyperelastic constitutive model,the finite element simulation model of the foamed silicone rubber static sealing system was established.The von Mises stress and contact pressure distribution of the foamed silicone rubber under a large compression amount were obtained.The simulation results show that the von Mises stress and contact pressure of the foamed silicone rubber at the symmetrical centerline position are larger,and the contact stress values at the rubber edge and near the limit ring are sharply increased.The hot air aging test at 140 ℃ was conducted,and the stressstrain curve of the foamed silicone rubber after aging was measured.The finite element simulation model was used to analyze the variation of von Mises stress and contact pressure of the foamed silicone rubber after aging.The results show that after hot air aging,the equivalent stress and contact pressure of the foamed silicone rubber are increased under certain load.