To achieve the oil-less fusing of the color toner, the large amount of the wax is included in the color toner. It is true the wax is useful to improve the fusing ability, however the large amount of the wax makes the durability of the toner worse. So, it is difficult to apply the large amount of the wax to the color toner.In this paper the investigations to apply the various kinds of waxes to the polyester color toner used in the nonmagnetic single component development system are reported. As a result, it was found 1) the wax having the low melting point gives the good fusing ability. 2) The fusing ability is effected not only the melting point of the wax but also the dispersed size of the wax in the toner. 3) The more the wax is contained in the toner, the better the fusing ability is. 4) The bigger the dispersed size of the wax is, the worse the durability of the toner becomes. Consequently, on the non magnetic single component development system, to obtain the good fusing ability and the enough durability, it is necessary to disperse the wax having the low melting point to the proper size.