In order to reduce friction by using the hydrodynamic pressure generated by the fluid flowing through the shallow groove,different micron grooves were machined on the surface of bidirectional rotating axial sliding support of the vehicle,including elliptical groove,arc groove,triangular groove,trapezoidal groove and rectangular groove.Considering the effects of cavitation and fluid inertia,the incompressible unsteady Reynolds equation based on the mass conserving boundary condition was solved by numerical method,the effects of the structural parameters of different groove(groove number,groove width ratio,radial width) and operating parameters (speed,groove depth ratio) on the lubrication performance were analyzed.The results show that,among the five types of grooves,the triangular groove has the largest bearing capacity,following by circular arc,trapezoid,ellipse and rectangle.It is beneficial to reduce the temperature rise of lubricating oil by increasing the groove width ratio,groove depth ratio and radial width,and it is helpful to reduce the cavitation rate by increasing the groove depth ratio.Among the five types of grooves,the rectangular groove has the biggest flow rate of lubricating oil and the temperature rise of lubricating oil is the lowest,while the trapezoidal groove has smaller cavitation rate.