In order to study the deformation distribution of supercritical carbon dioxide dry gas seal ring and reveal the influence of operating conditions on the deformation of the seal rings,while considering the CO2 real gas effect,a thermalfluidsolid coupling calculation model considering the convective heat transfer of the seal ring was established.With the aid of CFD and CSM computer simulation technology,the deformation law of dynamic and static rings of supercritical carbon dioxide dry gas seal under multiple loads was studied.The research results show that the maximum axial thermalfluidsolid deformation of the sealing ring appears on the coupling surface,and the thermal deformation and the force deformation are in opposite directions,in which the thermal deformation plays a leading role.As the speed increases,the maximum axial thermal deformation and force deformation of the sealing ring are increased,and the maximum axial thermalfluidsolid coupling deformation of the moving ring is decreasesd.As the medium pressure increases,the maximum axial force deformation of the moving ring and static ring is increased by 66.25% and 6.18% respectively,and the maximum axial thermal deformation and thermalfluidsolid coupling deformation are both decreased.As the inlet temperature rises,the maximum axial thermal deformation of the moving ring and static ring is increased by 40.79% and 34.90% respectively,and the maximum axial force deformation basically does not change.