The contact characteristics of graphite circumferential seal in some aeroengine were analyzed by the ANASYS based on the analysis of structural force.The acting laws of the maximum temperature,maximum deformation,maximum stress and contact pressure for the seal ring under different working conditions were studied.The results show that the stress distribution is uniform on the main seal surface of graphite circumferential seal ring,and the maximum stress appears in the lapping area of joints,this is consistent with the actual serious wear condition at the joint.The stress distribution on the auxiliary seal surface and seal runway is uniform,the stress along the radial direction of sealing seat end face is in gradient distribution,and the maximum stress is located at the sealing seat near the edge of the sealing runway.With the increase of the sliding velocity,the maximum temperature of the main seal surface for the seal ring is increased,while the maximum deformation,maximum stress and contact pressure are reduced first and then increased.The maximum temperature,maximum deformation,maximum stress and contact pressure of main sealing surface are increased with increase of the sealing pressure difference.