The effects of $^{60}Co;{gamma}-Ray$ irradiation on TSC characteristics of TFE type polytetrafluoroethylene(PTFE) were investigated. The $alpha$ peak on TSC curve of PTFE was decreased, while the $eta$ peak was reversely increased by the increasing of $gamma$-irradiation doses up to 80 krad(0.8 kGy). Moreover, $alpha$ and $eta$ peaks on TSC curve of the irradiated PTFE are changed with the increasing of the forming temperature and forming electric field. In annealing the irradiated PTFE specimens at room temperature in air, it was shown a continuous recovery of TSC characteristics with time, which is assumed the traped charge carriers are liberated from the shallow traps and undergoes a recombination process during room temperature decay.