The dielectric properties that effect to electric safety for unsaturated Pelvester resin were studied over the temperature range of 30-40［$^{circ}C$］ and the frequency range of 110~3$ imes$10$^{6}$ ［Hz］. According to the results of the study, it has been observed that two kinds of dielectric losses in electric safety were existed by the molecular movement of C-H and OH group. When the ,adio of hardener was 1.5［%］, the characteristics of specimens were excellent in view of the electrical materical. In the range of measuring frequency the dielectric constants and the dielectric losses were 3.5~5.5 and 10$^2$~10$^3$ respectly. The activation energy of loss spectrum in aspect of electric safety and the entropy appeared at the 30［$^{circ}C$］ were 33.4［Kacl/mole］ and 54.9［cal/mole.deg］ respectly.