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With the development of spintronics,spin-transfer torque control of magnetic properties receives considerable attention.In this paper the Landau-Lifshitz-Gilbert equation including the torque term is used to investigate the magnetic moment dynamics in the free layer of the ferromagnet/non-magnetic/ferromagnet (FM1/N/FM2) structures.It is found that the reverse critical time τc decreases with the current increasing.The critical time τc as a function of current for the perpendicular and parallel easy magnetic axes are the same.The critical time τc increases with the damping factor α increasing.In the case of large current the influence of the damping factor α is smaller,but in the case of little torque the critical time τc increases greatly with the damping increasing.The direction of the magnetization in the fixed layer influences the critical time,when the angle between the magnetization and the z direction changes from 0.1 π to 0.4π,the critical time τc decreases from 26.7 to 15.6.