The fatal demerit of resin materials which causes a marginal sealing defect or marginal fracture is hard to eliminate.A series of studies seeking for dental resin for restoration having no polymerization shrinkage, applying polyester resin used as base resin.This study was conducted to promote the improvement of composite resin, in which the author examined the composition with catalyst, accelerator and subaccelerator having preferable working time, setting time and peak temperature which is not clear, so as to obtain the fundamental data.In accordance with the increase in the amount of catalyst, accelerator and subaccelerator added, peak temperature showed a tendency to increase.Contrarily, working time and setting time showed a tendency to decrease.The composition showing preferable working time, setting time and peak temperature, is as follows:to the base resin, polyester with 38wt% of shrinkage inhibitor mixed, catalyst by 1.0wt%, accelerator by 0.50wt% and subaccelerator by 0.02wt% were added.The trial product of composite resin a 70wt% of surface-treated glass beads added showed a working time of 2.3 minutes, setting time of 9 minutes and peak temperature of 57.0℃, approximately the same values as of commercial composite resin.