In dielectric barrier discharge, due to discharge intensity, ambient temperature, gas concentration, gas pressure and other factors, the characteristics of nonlinear load variation, the load resonant frequency of the resonant circuit will change, if the resonant frequency of power supply frequency is not very good tracking and matching load, will lead to a decrease in the the efficiency, this paper proposes a frequency tracking technology. By sampling the load current through the zero comparison and pulse shaping, feedback to the power supply terminal synchronization, real-time detection, frequency tracking load resonant circuit. Through the principle of design, debugging, verification of frequency tracking technology in dielectric barrier discharge Efficient and feasible.