The kinetics of polymer particle formation and distribution of acrylic monomers between a solution and polymer particles at the graft polymerization of acrylic monomers onto polysaccharides have been investigated. The polyacrylic particle number increased at the first stage of polymerization of soluble monomers. At the second stage of polymerization, the number of particles was always constant. The concentration of adsorbed monomer decreased during the polymerization process. The monomer concentration in dispersed phase was higher than in solution. The mathematical model taking into account the rate of monomer polymerization, aggregation of oligomer radicals and their conformation changes, adsorption of monomer in the polymer particles has been proposed. Based on the experimental results, some constants of the process were calculated.