An electronic paper device is provided. The electronic paper device includes a touch panel, a conductive layer, a plurality of pixel electrodes, an electrophoretic ink layer, a common electrode layer, and a processing unit. The electrophoresis layer is electrically connected between the plurality of pixel electrodes and the common electrode layer. The conductive layer and the common electrode layer respectively have a different voltage. When the user touches the electronic paper device, causes the touch panel produce a touch signal and the conductive layer contacts a pixel electrode corresponding to the touch position. Then the processing unit determines the touch position according to the touch signal. The pixel electrode obtains the voltage of the conductive layer and an electric field is form between the pixel electrode and the common electrode layer. This causes the color to change at the position that is corresponding to the touched position.