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P (St-BA-VBT)/dye colored nanoparticles were prepared by staining P (Styrene-Butyl Acrylate-VinylBenzyl Trimethylammonium chloride) nanoparticles synthesized by soap free cationic emulsion polymerization with reactive dyes. The effects of reactive dyes dosage, dyeing temperature and time on amounts of dyes adsorbed on the nanoparticles were analysed. Results showed that when Reactive Red 195 dosage was 5.25%, the adsorption amounts of dyes on the nanoparticles reached a maximum value of 18.64 mg/g at 65℃for 90 min.