This paper studies the influence rule of operating temperature and load changes on the resonant frequency of the transducer and a feedback control system is designed to realize the resonant frequency tracking. Firstly, the resonant frequency calculation model with operating temperature T and load F as independent variables is derived based on the electromechanical equivalent circuit of the magnetostrictive transducer, a temperature-controllable and load-adjustable resonant frequency test system is built; then, the methods of segmental linear fitting and surface numerical fitting are performed experiment on the tested data, and a binary function model of resonant frequency with respect to the temperature and load variables is obtained to meet the requirements of linear correlation and surface fitting goodness, and the relevant parameters of the resonant frequency calculation model are determined. Finally, based on the caculation model, a frequency tracking feedback control system reflecting temperature and load changes was designed and the output characteristics of the transducer were tested. The results show that the vibration acceleration amplitude of the transducer is increased by about 31. 11% in average, and the resonant frequency could be automatically adjusted according to the temperature and load changes to achieve high efficiency and stable operation.