Abstract: The polymerization of methyl methacrylate initiated with piperidine derivatives (piperidine, 2,-2, 6, 6-tetramethyl-4-hydroxyl piperidinc, N-cthyl piperidine, 1,2, 2, 6, 6-pentamethyl-4-hydroxyl piperidine) and organic peroxides (benzoyl peroxide, lauroyl peroxide, t-butyl hydroperoxidc, t-butyl peroxybcnzoatc) systems was studi-ed in this paper. The polymerization rate cquation and the activation energy of polymerization were determined respectively.