This paper deals with theoretical treatments for the deformation mechanism of liquid crystal rods by light scattering under H-v polarization condition, when the rods oriented by a shear flow are acted on by a rectangular electric pulse along the direction of the velocity gradient of flow. As in one example, the calculations were carried out to check whether the complicated orientational behaviour of superstructures such as rods and/or spherulites cause significant effect on the profile of H-v light scattering patterns. In the present system, the orientation distribution function of rods was obtained as the solution of the rotational diffusion equation for rotational ellipsoidal particles. In actual calculations for light scattering patterns, the orientational fluctuation with respect to the rod axis is considered to explain the circular type pattern under no external excitation which has been reported in previous experiments. When the orientation functions provide curves showing two peaks by the proper choice of parameters concerning electric held strength and velocity gradient, the corresponding H-v light scattering pattern showed four small dull lobes in the vertical direction indicating the preferential orientation of rods with respect to the shear flow direction in addition to the four sharp large lobes in the horizontal direction indicating the preferential orientation of rods with respect to the electric held direction. This indicates that the H-v light scattering pattern influences the two kinds of orientation of rods.