Abstract: The high-power ultrasonic power supply needed by former oil well processing near borehole zones has the characteristics of large capacity, stable frequency and high output power factor. In actual work, in order to send the high power ultrasonic vibration energy, which is stimulated in the well, into different strata with different acoustic parameters through the well fluids, casing and cement of the cased well, the key parameters of the system need to be real-time measured and the related parameters need to be adjusted in real time. To meet these needs, the MCS STM32 is selected as the core of the system. Based on its precise timer, PWM output can be realized so as to provide waveform which makes IGBT work; Using the method of digital signal processing, MCS STM32 can automatically process the phase difference and amplitude ratio information of current and voltage waveforms, which are collected by STM32’s dual AD converter at the same time. Taking this as the foundation, we can adjust the frequency of the transmitted waveform to the resonance frequency of probe. Ultimately frequency tracking and effective stimulation can be realized. Moreover, with the help of the theoretical model,we can obtain the acoustic impedance in cased well from further processing of voltage and current, so that the acoustic impedance change during the actual work can be monitored.