Five methods were used to measure the reactivity ratios of copolymerization of Tributyltin Methacrylate with MMA.The mean error was gotten from the duplicate exper iments and the 95% credible regions of the reactivity ratios were drawn by the RREVM computer software.Through comparation of credible regions

the evaluation of the accuracy of methods is given.Copolymers PTBTM co MMA were prepared by radiation copolymerization which is radical reaction.The result shows that the method of element analysis and UV or AAS all of these can use to measure the reactive ratios of this copolymer precisely.We made a comparison by the RREVM computer software and discovered the method of UV and element analysis is the best method

but AAS is better than other methods.So we found some better methods than the reference says.