In the cure process of fiber reinforced plastics accumulators, thermal spike due to exothermic reaction of the resin appears. It is necessary to accurately evaluate thermal spike for avoiding trial and error approach of temperature control for quality guarantee. We have developed a cure process simulator that is able to accurately evaluate the thermal spike of the thermosetting resin. Simplified meso-scale finite element model with definite separation of fiber and resin is used in the simulation. In this study, newly developed simulation system is examined through comparing with the experiment of cure process of fiber reinforced plastics accumulators.