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It was first found that Ind2Y(μ-Et)2A1Et2 and Ind2LnN(i-Pr)2 (Ln = Y, Yb) exhibit extremely high catalytic activity in the polymerization of methyl methacrylate. The reactions can be carried out over a quite broad range of polymerization temperatures from -30 to 50°C. PMMA with high molecular weight (7.8 × l0-5) and high isotacticity (94%) can be obtained by using Ind2Y(a-Et)2A1Et2, and narrow molecular weight distribution (Mw/Mn < 1.5) can be obtained by using Ind2LnN(iPr)2 (Ln = Y, Yb).