In this paper, It is studied that the variation of the dielectric absorption of the specimen according to the change with $^{60}$ Co-${gamma}$ ray irradiation dose of the influence of temperature and applied voltage. In order to investigate the effect of irradiated oriented polypropylene film, we have observed dielectric properties within the temporature range of 30~130 ($^{circ}C$) and voltage range of 100~250 (V). As for the dependency of temperature by tan $delta$, the $alpha$ peak which appears at high temperature increases accordingly to the increment of irradiation dose which is contributed by the crystal region and moves towards the high temperature. The $eta$ peak which appears the orientation by dipoles and molecular motions in the amorphous region at low temperature. For the dependency of voltage by tan $delta$ at low temperature, the peak of the tan $delta$ shifts accordingly to the increment of irradiation dose towards the high temperature region.