According to the application prospect of the miniaturized ultrasonic motor,and focusing on the miniaturization problem of the ultrasonic motor driving circuit,a miniaturized driving circuit based on resonant boost principle is designed.To reduce the colume of the driving circuit,the resonant boost and micro half-bridge inverter are applied to exclude the transformers which are difficult to be miniaturized.Based on the modeling of the ultrasonic motor equivalent circuit and the analysis of the LC resonant circuit,the driving circuit output waveform,the selection of the best matching inductor and the influence of real inductance are researched.The resonant boost output waveform is analyzed based on Matlab/Simulink simulation platform.The driving performance of the resonant boost circuit on the columnar traveling wave type ultrasonic motor is verified by experiments.The experimental results show that the performance meets expectation,and the size is much smaller than the traditional driving circuit with transformers.