Abstract: A new type of organic-inorganic hybrid latex was synthesized by free radical seeded emulsion (co)polymerization with the participation of hydrolysis-condensation reaction. The kinetics of these two simultaneous reactions determines the microstructure and properties of latex particles. A model of monomer partition was developed by using a partition constant. A free radical seeded emulsion polymerization model with the monomer partition was presented. On the basis of these two models and the features of hydrolysis-condensation reaction for the functional groups in various phases in the heterogeneous system, a complete kinetic model of free radical seeded emulsion polymerization with the participation of hydrolysis-condensation reaction was established. The complete model explains the principle of mass transport,characteristics of heterogeneous reaction and the interaction of free radical (co)polymerization and hydrolysis-condensation reaction in this system.