This paper researched the dynamics characteristic of the locomotive with the drive gear by spring suspension and the locomotive with the drive gear by rigid suspension, and researched the strength of structure of the gearbox and suspension-beam for the drive gear with spring suspension by dynamical characteristic of the high-speed bogie with AC traction motor. The result is that the dynamics indexes of the locomotive with the drive gear by spring suspension should be excelled compare with the locomotive with the drive gear by rigid suspension; the drive gear with spring suspension has the technical advantage for high-speed locomotive, the main parts of the drive gear with spring suspension should be adapted for dynamical characteristic of the high-speed bogie and satisfy with structure strength.