Free radical polymerization of methylmethacrylate was studied using filled tubular reactor with some axial dispersion effect, such as a near plug flow pattern, due to intensive radical mixing induced by static mixers. It was of interest to investigate how the performance of the filled tubular reactor has been investigated by model simulations. Both start-up transient and steady state behaviors of reactor were investigated through model simulations. The model simulation results in continuous filled tubular reactor could obtain the monomer conversion of 0.6, which was higher than in CSTR. And the optimalinside diarmeter of filled tubular reactor was 2.54cm. The model simulation results suggested that the filled tubular reactor could be potentially a good continuous reactor for the polymerization of methlmethacylate. In this study, the filled tubular reactor was potentially a very important new polymerization technology.