Colored polymer particles were prepared by dispersion and seeded polymerization. The reasons of polydisperse and low conversion were investigated in terms of mechanism. Although a little higher conversion and monodispersity of colored polymer particles were produced by seeded polymerization, the dye still acts excessively as chain transfer to 2^nd monomers. By adding MC with 2^nd monomer, monodisperse colored particles having high conversion were obtained. From the elution test in ethanol, it was confirmed that the dye was entrapped stably in the particles.