The effects of filler on the reaction of an epoxy system cured with aromatic diamine have been studied within the temperature range 70 similar to 130 degrees C using a differential scanning calorimeter. Various kinetic models including homogeneous reaction, diffusion-controlled reaction, surface reaction and nucleation and growth models have been tested. Kinetic analysis using integral and derivative procedures on the isothermal data indicates that the cure reaction process can be described well with the autocatalytical and surface reaction models. However, it has been found that the catalysis of fillers can be retarded effectively by the curing temperature.