Some shape memory alloys is characterized by the phenomenon of reversible deformation in the reverse transformation under the influence of mechanical stresses from the martensitic state, free of macroscopic phase deformation. Following some experimental data, the amplitude of this effect may be of the same order of magnitude as the phase distortion, accumulated in the direct transformation under the influence of the same voltage. We propose a modification of the well-known equation for determining the velocities of phase deformation in the reverse martensitic transformation to describe this effect. The proposed ratio reversible deformation in the reverse transformation can be observed in the case where the foregoing direct conversion occurred at lower voltages than a subsequent inverse (provided these voltages alignment).