The pure and the cured epoxy resin was characterized by the integral and partial thermally stimulated depolarization current (TSDC) in the range of the glass transition. The function of the activation energy (E) vs. T obtained by use of the integral current curve I-i(T-i) by direct transition of points I-i into E-i showed only one linear course without peculiarities. The E(T) function obtained by use of a series of the partial peaks showed several linear stages. The relaxation maps (RM) were drawn and the compensation points (C) were determined. The coordinates of C’s for cured resin in comparison with the pure resin indicated a decrease in motion of the moving parts in resin due to the curing. The relative numbers of the relaxing dipoles (N) vs. E were approximated. The related energy distribution width omega in the cured resin was significantly decreased.