In order to explore the influence of the structural parameters of the split type carbon ring seal on the radial deformation of the sealing surface,the numerical calculation was used to solve the pressure control Reynolds equation to obtain the gas film pressure.The fluid-solid thermal coupling simulation was conducted in combination with the finite element analysis software to explore the influence of different structural parameters on the radial deformation of the carbon ring under specific working conditions,and the radial deformation characteristics of the main sealing surface was analyzed.The results show that the installation position of the anti-rotation pin has the greatest influence on the radial deformation of the carbon ring,and the radial deformation can be reduced by selecting the appropriate installation position.When the external convex structure is uneven and the ratio of the center angle is large,the radial deformation is small.The larger the ratio of the lap joints on both sides,the smaller the radial deformation.The selection of tension spring and compression spring has little influence on the radial deformation of carbon ring.The larger the spring pressure,the smaller the radial deformation.However,when the spring pressure is too high,it can easily lead to increased wear,fracture of the carbon ring,and even the failure of seal.The refore,appropriate spring pressure should be selected based on actual working conditions.The research results provide a reference for the structural optimization design of split carbon ring seals.