A series of nano Fe₃O₄ / epoxy shape memory composites were prepared by doping magnetic Fe₃O₄ nanoparticles with shape memory epoxy resin EP5-60% as matrix. Infrared test shows that the magnetic Fe₃O₄ nanoparticles were successfully modified by KH550, and the thermal response recovery temperature is 80 ℃ measured by DSC. When the mass fraction of modified magnetic Fe₃O₄ nanoparticles is 7%, the mechanical properties of Fe₃O₄-7%/EP5-60% composite are the best, the tensile strength is 29 MPa and the elongation at break is 37.3%. The thermal response shape memory properties of Fe₃O₄-7%/EP5-60% were tested by bending recovery test. The thermal response shape memory fixing ratio (Rf) is 99%, and the recovery ratio (Rr) is 97.9%. The shape recovery process of Fe₃O₄-7%/EP5-60% magnetic response was recorded by video recording method. The deformation can be recovered within 25 min, and the recovery ratio of magnetic response is 93.3%. The above results show that the Fe₃O₄ / epoxy shape memory composites with good magnetic-thermal dual response can be prepared by using the magnetic properties of Fe₃O₄ nanoparticles and controlling doping content.