A novel method and the experimental result of the vertical area partition for recording the elemental master holograms in a multiple-exposure rainbow holography are reported. By using this vertical area partition of the recording material to record the elemental master holograms in cycle, 3-D achromatic synthesis of a set of 2-D patterns can be reconstructed. Combined with a plane diffraction grating to compensate the horizontal dispersion during the reconstruction, a bright 3-D synthesized achromatic images with a wider vertical viewing angle, higher resolution, and lower color blur have been obtained in white light reconstruction.