An astigmatic system constructed by inserting a certain amount of astigmatism, a cylindrical concave lens with a large radius of curvature-into a typical one-step rainbow holographic configuration is proposed as orthoscopic configuration to fabricate one-step rainbow holograms. The possibility of obtaining a visual-distortionless reconstructed image by using such system is analysed theoretically. Experiments show that when the rainbow hologram fabricated by such technique is reconstructed for primary image whith a white light point source, a good stereoscopic, quasi-monocliromatic, 3-D orthoscopic image is obtained.