In the laser-driven inertial confinement Fusion and pinch implosion, the monochrome X-ray backlight imaging is the major technology to obtain the plasma characteristics and behavior of target imp losion.In order to obtain the two-dimensional spatial information,a novel X-ra y backlight imaging system is developed based on the Bragg diffraction theory.The spherically bent quartz crystal analyzer is the most important compo nent of the image system,where the bent crystal radius is 143mm.The X-ray imaging experiment is performed on the SG-III prototype faci lity at Chinese Academy of Engineering Physics.In the experiment,the laser radiation is focused on the plane of Mg target,in which the high-temperature plasma is produced,used as the backlight source.The imaging object is the 15μm by 15μm square mesh array. The X-ray CCD is used to obtain two-dimensional monochromatic backlight mesh image.By analyzing the backlight mesh imaging info rmation in the experiment,the backlight imaging system provides an approximate 5μm spatial resolution and a 7.8mm by 2.6mm field of view (FOV).It is demonstrated that the backlight imaging system is adequate for monochromatic X- ray imaging diagnosis.