Abstract: To solve the problems of large size and small output torque of traditional drive system, an electromechanical integrated giant magnetostrictive material (GMM) drive system was proposed, providing with compact structure, high driving efficiency and torque addition along with speed reducing. Firstly based on the structure and working principle of drive system, the statics-equations of electromagnetic drive part were established with the constitutive equation of giant magnetostrictive material, obtaining the output displacement and forces of the drive part. Analyzing the driving relationships between oscillating tooth and discs, a spatial force model was established for oscillating tooth, obtaining the received forces of every tooth with the force equations in transmission plane. Then several results were achieved, deriving the forces on oscillating-teeth-holder and output torque of the drive system, analyzing the variations of forces on oscillating tooth and the output torque, and discussing the influences of drive current and structural parameters on output torque. The results show that eccentric distance of moving disc has great influence on output torque of the drive system.