Abstract: The catalytic action of some ionic surfactants of alkylammonium carboxylate type in the photopolymerization of MMA initiated by benaophenone/triethylamine/oxygen system has been studied. Experimental results show that the rate of polymerization depends upon the type, molecular structure and concentration of the surfactant. As a result of the accelerating effect of the surfactants on photosensitized decomposition of hydroperoxides formed in the system, the qiantum yield in the photopolymerization is increased by 2 times.