In order to characterize the low temperature relaxation of epoxy resin modified with amine-terminated butadiene acrylonitrile copolymers (ATBN), thermally stimulated current (TSC) and relaxation map analysis (RMA) were investigated. Four relaxation peaks at around -140, -100, -60 and 0 degrees C were observed as the indication of gamma-, beta-relaxation of epoxy resin, T-g, new unknown peak of ATBN, respectively. The unknown peak at around 0 degrees C was observed due to dipole orientation. The RMA data was showed that compensation temperature (T-c) and degree-of-disorder (DOD) were increased with increasing the content of acrylonitrile and ATBN, whereas the compensation time (tau(c)) was decreased. It can be concluded that the cooperative molecular motion in cured epoxy resin was more active as the concentration of acrylonitrile and ATBN content increases.