A photosensitive drum for image forming apparatus includes an inner roller, an outer roller and a photoelectric conversion layer. The inner roller of circular cylindrical shape is formed by a cathode substrate. The outer surface of the circular cylinder is configured with a plurality of cathode units. The outer roller of hollow circular cylindrical shape is formed by an anode substrate. The inner diameter of the outer roller is greater than that of the inner roller such that the inner roller is snugly fitted inside the outer roller. The anode substrate includes a plurality of anode units corresponding to the cathode units. The photoelectric conversion layer is a hollow circular cylinder with an inner diameter greater than the outer diameter of the outer roller such that photoelectric conversion layer is snugly fitted onto the surface of the outer roller. An electric potential difference is applied on the cathode substrate to induce the electron beam generated by the cathode unit to impinge on the anode unit to produce light. The generated light is directly converted into electrostatic by the photoelectric conversion layer to adsorb on the surface thereof to adsorb toner powder. The toner on the surface of the photosensitive drum is then transferred and fused on paper to form image.