2-dichloroethane solvent with dimethylketene methyl trimethyl silyl acetal (MTS) as initiator at 0℃ were studied. The relationship of MMA concentration with time at 0℃ were shown in Figure. The polymerization rate are zero order with respect to monomer concentration. The relationship of rate constant K between initiator concentrations [I] may be written as:The plots of In K against In [I] present the linear relationship