S-seal is a special type of sealing ring designed to meet the high temperature,high pressure and complex fluid media conditions in the oil and gas industry.In order to study the structural strength and sealing performance of S-seal,a two-dimensional axisymmetric model of the S-seal was established,and the effects of compression,medium pressure and temperature load on the structural strength and sealing performance of the sealing surface under installation and operation conditions were simulated.The results show that under the preloading condition,the maximum equivalent stress and the maximum shear stress appear in the inner center of of the S-seal elastomer,and the maximum equivalent stress distribution is axially symmetric.Under the working condition,the maximum equivalent stress and the maximum shear stress are in the middle near the clearance position.With the increase of compression and medium pressure,the maximum equivalent stress and the maximum internal and external contact pressure of the elastomer increase.With the increase of temperature,the maximum equivalent stress and the maximum internal and external contact stress increase,but the increase trend of the maximum equivalent stress is small.The research results provide theoretical support for the performance and strength optimization of the S-seal.