A novel zero current switching high frequency inverter as a power supply for the high-intensity ultrasonic homogenizer was developed to realize the high cost performance and stable operation in wide range of load. In this paper the procedure of the circuit design was described on the basis of numerical analysis with respect to the distortion factor of output voltage, power factor and switching stresses. Furthermore, the emulsified fuel oil with water by using high-intensity ultrasonic homogenizer was generated and estimated.