The objective of this paper is to investigate the effect of toner charge on the developed toner mass in a two-component development process using the discrete element method. The behavior of toner particles having homogeneous charge (-40 to +140 μC/g) or distributed charges (which were measured in experimental work) were simulated. When toner particles had extremely large charge, they failed to adhere properly on the latent images, because only a few toners bridge the electric potential difference between the photoreceptor and the latent image. On the other hand, the adhesion force between toner and carrier was much larger than the electrostatic force under the conditions of smaller toner charge. Then, the toner particles could not fly to the latent image from the surface of carrier particles under the applied electric field. The adhered toner mass becomes large when the average charge is around 25-45 μC/g. In particular, homogeneous toner charge is better for printing with high efficiency.