Abstract: Much significance has been given for a long time to the application of magnetostrictive micro-displacement actuators to ths error compensating system in mechanical and optical engineering. As a certain spsed is required for the actuator of a specific error compansat i ng system, so a study on the characteristics of the dynamic response speed of magnetostriction is essential.In this paper,the transfer function and the dynamic response characteristics of magnetostri ctive micro-displacement actuators are studied. Both the theory and the method of dead-beat correction and multiple-beats same-velocity correction with the aid of a single board computer are also investigated, aiming at a further increase of the response speed. The computer-aided close-loop correction system is used in the experiments cf frequency response and the imitation of tracking the compensating signals of a lathe spindle.The idea about the same-velocity correction suggested by the author is also of reference value to other similar control problems.