Alkyl methacrylate monomers with three kinds of dendritic fragments as alkyl groups, two kinds of Frechet-type and a new type with 3,5-diphenoxybenzyl as first generation, were prepared by reaction of the corresponding dendritic bromides with methacrylic acid in good yield and were homopolymerized with a radical initiator. Polymers with side groups in first generation had a degree of polymerization (<(P)over bar (n)>) of 17-24, markedly higher than those with side groups in second generation, <(P)over bar (n)> approximate to 6-7.