Abstract: The current technical level of inspection of welds with Xrays is analyzed and with which some drawbacks are pointed out. Approaches based on human inspector or computer to detect and evaluate radiographic films and digital radiographic images of welds are introduced respectively. The state-of-the-art of automated evaluation of digitized radiographs and digital radiographic images of welds is described in detail. It is concluded that the digital radioscopy is the tendency of defect detection in welds and the technology about automatic identification and evaluation of X-rays digital image are the foundation of making digital radioscopy a success.