In recent years, printing speed and resolution in digital printing have been increasing according to various market requirements. As a result, it is required that the toner behaviors in developing system is controlled more precisely and uniformly. In the electrophotographic system, toner charge is one of the important factors to identify toner behaviors.In general, Charging Control Agent (CCA) is necessary for toner to obtain stable and superior image quality. CCA provides quick charge and suitable triboelectric charging level. Therefore, toner triboelectric charge can be affected by a variety of CCA, CCA content, and so on. In addition, maintenance of a stable and uniform charge requires a balancing of many complex interactions.In this review, the charging characteristics of CCA are discussed and illustrated using actual experimental data in non-magnetic one component developing system. It is found that the performance of toner charge depends on the type and amount of CCA. We have designed optimum condition to obtain the better performance of toner charging.