The mixture of Hexamethoxymethylmelamine (HMMM)-triethylene glycol(T3EG) and triethylene glycol dimethacrylate (T3EGMA) can be cured by hybrid polymerization consisted of condensation polymerisation and radical polymerisation at higher temperature in presence of latent acid catalyst such as t-2-hydroxy-cyclohexyl tosylate(TCHTS) without radical initia-tor．This mixture system provides a synergetic effect on curing reaction，and that has been at-tributed to the presence of adventitious peroxides and the conversion of peroxides to initiating tadicals．It has been considered that The HMMM is not only a crosslinking agent but also an accelerater of the oxidation of active methylene groups，and the acid generated from TCHTS plays the role of the catalysts for the conversion of hydroperoxides into free radicals as well as．for the transetherification．This consideration is supported by the results of the oxygen ab-sorption examination，active oxygen content determination and gel time studies．