Abstract: The kinetic models of aqueous polymerization for acrykmitrile was established in terms of its polymerization mechanism and granulation mechanism. Two kinetic models of polymerization, corresponding to micromixing and macromixing respectively, were developed on the basis of the Danckwerts-Zwie-tering micromixing theory. The experimental data of conversion and number-average molecular weight, obtained from a continuous stirred-tank reactor, were used to check the two models. It was found that a micromixing kinetic model is more suitable for describing the process of acrylonitrile continuous polymerization in aqueous medium.