The characteristic of the dielectric relaxation in silicone rubbers were studied in the frequency range of $1{ imes}10^2{sim}3{ imes}10^6Hz$ at the temperature range of $30^{circ}{sim}170^{circ}C$. As the results of the study, it has been confirmed that the silicone rubber containing the cross-linking agants of 2,5-bis(tert-butylperoxy)-2, 5-dimethyl hexane exhibit the dissipation spectra of two kind(${alpha},;{eta}$ dissipation) due to the siloxane and methyl groups. Particularly, the maximum value of dielectric loss spectra of silicone rubber combinning the cross-linking agents of 0.7phr to 1.0phr are on the increasing in high frequency region, but the specimen of above 1.0phr become smaller again. The energy and the entropy of activation on the molicular motion obtained 18.32 kcal/mole and $1.48ca1/mole{cdot}deg$ in measuring condition respectively.