The technology of surface modification was an efficient way to increase fatigue life of the mainshaft bearing of the aircraft engines.On the basis of theoretical analysis of the surface modification

this paper proposed a new strengthening treatment technology of the raceway surface for the mainshaft bearings(i.e.luster polish strengthening treatment)

and designed a corresponding special machine for luster polish strengthening treatment(the centrifugal strengthening machine).The experimental results show that the surface hardness of the raceway is increased and the surface roughness is improved and the residual compression stress is produced on the surface of the raceway

the method of luster polish strengthening can increase notably the fatigue life of the mainshaft bearings and decrease the degree of dispersion of fatigue life.