In order to reduce the density mismatch between TiO 2 and the low dielectric medium and improve the dispersion stability of the electrophoretic particles in the low dielectric medium for electrophoretic display application, polystyrene/titanium dioxide (PS/TiO 2 ) core–shell particles were prepared via in-situ sol–gel method by depositing TiO 2 on the PS particle which was positively charged with 2-(methacryloyloxy)ehyl trimethylammonium chloride (DMC). The morphology and average particle size of PS/TiO 2 core–shell particles were observed by transmission electron microscopy (TEM), scanning electron microscope (SEM) and particle size analyzer. It was found that density of PS/TiO 2 core–shell particles were reduced obviously and the particles can suspend in the low dielectric medium of low density. The PS/TiO 2 core–shell particles can endure ultrasonic treatment because of the interaction between TiO 2 and PS. Zeta potential and electrophoretic mobility of the fabricated core–shell particles in a low dielectric medium with charge control agent was measured to be −44.3mV and −6.07×10 −6 cm 2 /Vs, respectively, which presents potential in electronic paper application.