A new ultrasonic motor vibrator using longitudinal and bending modes was proposed in this paper. The motor vibrator are excited with two different groups of signal, a longitudinal and bending vibration mode response with π/2 time difference on the vibrator is excited by controlling the input exciting signals. Thus an elliptical motion is generated when the longitudinal and bending mode response is superposed on the driving foot of vibrator, and the rotor is driven to motion through the friction force between the driving foot and the rotor. The parametric FEM model is established based on analyzing the operating principle of the proposed motor vibrator. The structure parameter sensitivity of the modal characteristic frequency is analyzed through the modal analysis, and the longitudinal and bending modes of the vibrator are matched finally. The motion trajectories of nodes on the driving foot are analyzed. The result of transient analysis shows that the trajectory of node on driving foot is nearly an ellipse. The results of this work could be useful in the development of this new type of motor vibrator.