Taking the static ring assembly of the mechanical seal for aerospace turbopump as the research object,the contact pressure,the axial deformation of the end face and the distribution characteristics of the equivalent stress of the graphite static rings under static conditions were studied and compared by using the finite element method for the static ring seat with or without the clearance groove.It is found that the axial deformation distribution of the graphite ring seal end face of the static ring assembly without groove is in the shape of a divergent wedge along the radial direction and the relative deformation is relatively large,while the contact pressure,equivalent stress and axial deformation of the end face of the static ring assembly with groove are improved.The influence of the size,shape and groove position of the clearance groove on the force characteristics of the graphite static ring was analyzed,and the reasonable slot geometric characteristic value under static conditions was determined.The results show that it is more appropriate to open the clearance groove at the root of the radial side wall of the stationary ring seat,and when the groove width of the clearance groove accounts for about 1/2,the axial deformation of the stationary ring end face is minimized,which is beneficial to reduce the sealing leakage rate.Compared with other kinds of clearance groove structure shapes and characteristic dimensions,when the graphite static ring has a dovetail clearance groove,and the dovetail angle is 45°,the axial deformation of the end face has the least change along the radial direction,and the average assembly stress of the static ring is the smallest.