On the basis of our earlier work, the relaxation behaviors of the light diffraction intensity induced by the distribution of space charge in a-LiIO3 single crystals under the action of an electrostatic field have been investigated by using a space filter. The empirical expressions of the relaxation process were obtained. It was found that the parameters involved change with the temperature and from specimen to specimen, as well as depend both on the magnitude and the relative direction of the polarity of the crystal and the electrostatic field applied. When the temperature is lowered below a certain value (≈-25℃), the enhancement diffraction intensity due to the applied field becomes not quite evident. When the electrostatic field is applied at a temperature higher than the "freezing" point and then the specimen is cooled to a temperature below the latter, the magnitude of diffraction intensity enhanced by the applied voltage at higher temperatures remains unchanged, it is so even after removing the voltage. This "freezing" effect is parallel to that observed in the enhancement of neutron diffraction intensity.