In a method of transporting a photosensitive sheet for image forming operation, the photosensitive sheet is transported forward through an exposure section where a latent image is formed thereon, and then through a pressure-developing section where the photosensitive sheet is pressed against an image receiving sheet to develop the latent image and form a visible image on the image receiving sheet. In this pressure-developing process, the length of the photosensitive sheet which is drawn out from the sheet-feeding rod is measured. Then, the photosensitive sheet is further transported forward until the image receiving sheet is separated therefrom. Thereafter, the photosensitive sheet is transported backward by the length measured in the pressure-developing process. Since the photosensitive sheet is transported backward by the measured length after the image forming operation, the unused portion of the photosensitive sheet remaining between the exposure section and the pressure-developing section can be accurately transported backward to be used for the next image forming operation.