Abstract: The curing process of bis (2,3-epoxycyclopentyl) ether with aromatic diamines has been studied by differential scanning calorimetry (DSC) and torsional braid analysis (TBA).The DSCscans show that there are two separate exothermal peaks, both of which are proved to be the curing behavior of the reaction system. So it is suggested that the whole curing process proceeds in two stages.The mechanism concerning the two stages cure is discussed.From the isothermal cure curves obtained by TBAas a function of time, the results for the time needed to go to gel point fit Arrhenius relation, but two different slopes are obtained for the higher and lower isothermal cures curves, which might be related to the heterogenity of the reactive systems at lower isothermal cures, and homogenity at higher isothermal cures, where the reactive components are dissolved mutually and mixed intimately on a molecular level.Finally, the gelation-vitrification phase diagram is constructed and discussed.