In order to solve the spur bevel gear end meshing problem， through the straight tooth bevel gear profile modification， improve the small end of the oil film carrying capacity， making the distribution of load along the width of the tooth evenly. The second parabolic curve is adopted in tooth profile modification firstly， and then the height of the tooth edge trimming of the driving wheel and the driven wheel is changed. After determining the modification parameters， an elastohydrodynamic lubrication model is established for the straight line contact of the bevel gear with infinite line， the pressure and the film thickness are solved by the multigrid method， and the elastic deformation is solved by the multigrid integration method. The results show that the oil film pressure at the tooth point after trimming the edge is smaller than that of the original， and the oil film thickness becomes larger. After the second parabolic curve modification， the oil film pressure at the instantaneous point of engagement and instantaneous point of engagement is significantly reduced at the Hertz contact area. The oil film thickness in the Hertzian contact area increases significantly， the maximum oil film pressure on the grinding mesh distribution decreases， the minimum oil film thickness increases， the central oil film pressure decreases， and the central oil film thickness increases. Modification parameters affects the oil film pressure and oil film thickness after the modification， modification changes the load distribution in the direction of the tooth width， the load difference between the small end and the large end of the straight bevel conical gear is reduced， and the tooth surface load is transferred from the end to the middle of the tooth width. Tooth profile modification can improve the lubrication condition of the gears， increase the oil film pressure in the meshing process， reduce the friction and wear of the tooth surface， and at the same time avoid the occurrence of tooth surface glue.