Microencapsulation of electrophoretic dispersion is one of the key steps in realizing the portable electrophoretic display technique, electronic paper. In this study, electrophoretic TiO2 nanoparticles were uniformly dispersed in a dielectric medium of halocarbon oil and the TiO2 based core material was emulsified using a polymeric surfactant of poly( sodium 4-styrene sulfonic acid) ( PSSA). After the colloid particles were stabilized, the microencapsulation of the core materials was accomplished by the polycondensation of melamine/urea-formldehyde prepolymer. Average diameter of the microcapsules obtained was about 50 mu m and their thermal stability was measured by TGA. The surface morphology of the microcapsule was dependent on the molar ratio of melamine/urea to formaldehyde and the water content.