Abstract: In a method of developing triboelectric magnetic toner, an electrostatic latent image is formed on a substance, the latent image is developed by a magnetic brush method using a ferrite carrier of semiconductivity and a triboelectric magnetic tonor, and the developed toner image is transferred to a transfer member and fixed.By adding the semiconductive ferrite carrier, a lump of tonor is broken with a mechanical force of the carrier so as to increase the flowability of the tonor and to prevent the agglomeration of the tonor due to dielectric charging.