The purpose of this article is to study the cure kinetics of a diglycidyl ether of bisphenol A (DGEBA)/4,4'-methylene dianiline(MDA)/nitrile/ hydroquinone(HQ) system. Nitrile compounds such as malononitrile (MN), succinonitrile (SN) and glutaronitrile (GN) were introduced to serve as chain extenders and hydroquinone (HQ) was also added to serve as a reactive accelerator or a catalyst to lower the reaction starting temperature. The nitrile compounds/HQ was added at the ratio of 4:1 in phr. By adding HQ, reaction starting temperature and activation energies were decreased. The autocatalytic reaction carried out by -OH was accelerated and the cure reaction was already advanced at low temperature, which was elucidated in studies of cure behavior and cure kinetics by differential scanning calorimetry (DSC). Hydroxyl group offered by HQ aided the formation of termolecular transition state and ring opening of epoxide. So, the cure reaction was accelerated and proceeded at the low temperature. The triple bond of nitrile was also successfully reacted with primary mine and hydroxyl group at the low temperature and chain extension resulted from the formation of -NRC(O)NH- during cure was accomplished. Impact strength related to the toughness was increased.