Polymeric microspheres showing unique triboelectricity properties have been exploited in the electric photograph. Despite that fact that a lot of factors have been reported to affect triboelectric properties, quantitative consideration of these factors has been left for future works. In this study, suspension polymerization was carried out to prepare polymeric microspheres of ca. 100 mu m in diameter in which electrifying additives, such as carbon black (CB) and charge control agents (CCA), were,veil dispersed. The effects of additives on electrostatic capacities and physical properties of polymeric microspheres were investigated. It was found that the electrostatic capacity decreased with increasing CB content. The addition of CCA strongly affected the electrostatic capacities of polymeric microsphere. The effect of CCA on the electrostatic capacity is expected to be different for each CCA.