Abstract: A simple dynamic model was established to determine the effect of temperature on vibratory response of the giant magnetostrictive actuator, resulting in a differential equation of motion containing terms of temperature. Under known magnetization intensity, the effect of temperature and pre-stress on vibratory response was discussed, and a coefficient of temperature dependent displacement response determined. The resonance solution caused by giant magnetostrictive nonlinearity was derived, and the effect of temperature on resonance factors discussed. Simulation results indicated that magneto-thermo-mechanical coupled nonlinearity greatly affected vibratory response of the actuator, and that temperature should be considered in analysis and design of the actuator.