Abstract: A stereo x-ray system includes two grid-controlled x-ray tubes, a high voltage generator, a grid controller and an x-ray detector. The two grid-controlled x-ray tubes are aligned side by side and their anodes are apart from each other for a short distance. The x-ray output ports of the two x-ray tubes aim at the direction perpendicular to the x-ray detector. The two grid-controlled x-ray tubes are switched on/off in turn and irradiate the subject with alternating x-ray fields; thus, the left and right view x-ray images are alternately formed on the same x-ray detector. The left and right view x-ray images are independently transmitted to the image processing system. After necessary image processing, the stereo image pair is used for stereo displaying.