Abstract ：With orthogonal face-gear drive as the research object, a finite element model of face-gear drive is established. The FEA software of ANSYS Workbenck is used to analyze the model and the first 6 natural frequencies and mode shapes of the model are extracted. The influences of pressure angle, tooth number difference and face-gear aperture on the natural frequency of face-gear drive is studied. The results show that the modal vibration mode of the face-gear drive is mainly based on face-gear vibration, the natural frequency of face-gear drive increases with the increment of pressure angle, tooth number difference and face-gear aperture. In these factors, the impact of face-gear aperture is the greatest, followed by pressure angle, and tooth number difference has little effect.