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A study was made on plasma-initiated emulsion polymerization and kind of ultrahigh molecular weight poly(methyl methacrylate) (PMMA) was obtained. The viscosity-averaged molecular weight M_η of this PMMA is over 1 x 107 in the measurement of viscosity by using Butanone as solvent. Its glass transition temperature T9 and flow temperature Tf measured by DSC are 132.8 and 299.2 respectively.The effects of reaction duration, radiation power and polymerization temperature on the conversion and the molecular weight of the products were also investigated. The results of these studies suggest that by way of initiated polymerization, the molecular weight of polymer are greatly enhanced.