A method based on the minimum amplitude of LTE and axis force and vibration were proposed to reduce the vibration of double helical gears. Firstly, the modified tooth surfaces were represented by a sum of two vector functions that determined the theoretical tooth surface and the deviations surface. Secondly, a 10-DOF vibration model was established considering time-varying meshing stiffness and corner meshing impact and axial motion excitations based on TCA、LTCA. Finally, a improved algorithm was applied to optimize the parameters of modified pinion to get the best performance. The results show that the loads then tend to be uniform totally when considering both modification and axial motion, besides, torsional vibration mainly result from corner meshing impact and meshing stiffness excitation which have little effect on axial vibration , and is more sensitive to the impact than other excitations, meanwhile, the axial motions excitation contribute to both axial and swing vibration. In brief, the vibration decrease greatly because of smaller excitations with modified double helical gears.