Considering the influence of temperature,the fluid-solid thermal coupling numerical solution model of mechanical characteristics of floating ring seal was established,and the accuracy of the calculation method was verified.The flow field characteristics of the floating ring seal,and the mechanical properties of four floating ring seals made of graphene,graphite,aluminum and silicon carbide under different inlet pressure and temperature were studied.The results show that when the floating ring seal is eccentric,due to the existence of wedge clearance,the flow through the structure produces fluid dynamic pressure effect,forming a local high pressure area on the thin side of the fluid domain,the pressure on the thick side of the fluid domain does not change significantly.However,the temperature increases along the axial direction,and the greater the eccentricity,the greater the temperature at the eccentric position.The temperature of floating ring seal fluid domain decreases with the increase of inlet pressure.Because temperature affects the properties of materials,the floating ring seal structures of different materials are very sensitive to temperature.The deformation of floating ring seal of different materials decreases with the increase of inlet pressure,and the strain also decreases with the increase of inlet pressure.The deformation and stress of the four floating ring seals increase with the increase of inlet temperature.