Abstract: In order to improve the vibration suppression characteristics of sandwich structure, the research on the vibration control method of sandwich structure based on active temperature control variable damping technology was carried out. Based on the high damping property of the polymerized polymer in the glass transition zone, a technical approach to temperature control of the sandwich polymer material and increase its loss factor to improve the structural damping was proposed. According to this technical approach, a temperature-controlled sandwich beam with a polyurethane-modified epoxy material as the core material and a heating film in the middle was designed. The experimental study on the vibration response of sandwich beams under different control temperatures was carried out and the influence of temperature on the bending stiffness of sandwich beams was discussed. The experimental results show that the vibration response of the sandwich beam can be reduced by 8.85 dB compared with the normal temperature when the temperature of the sandwich beam is controlled near the left side of glass transition temperature(T_g). It is proved that the proposed active temperature-controlled variable damping technology has good vibration suppression effect.