To explore the thermal performance of high parameter compliant foil face gas film sealing and carry out structural optimization design.Based on fluid simulation analysis software,a thermal performance analysis model for foil face gas film seal was established.Considering the real gas effect of air medium,the gas flow and heat transfer characteristics of the sealing face were studied,and the influence of different working conditions and structural parameters on the highest and average temperatures of various fluids and solid domains on the sealing face was analyzed.The results show that the heat of the foil face gas film seal is mainly concentrated on the flat foil and the sealing dam.As the rotational speed increases or the inlet pressure and minimum gas film thickness decrease,the average and maximum temperatures of each fluid and solid domain of the sealing ring component increase.The average and maximum temperatures of each fluid and solid domain decrease with the increase of wedge height and pitch ratio.