Abstract: In a digital radiography system, the detector is a very important part. This paper uses domestic flat-panel detector 0505, and single-wall transillumination mode of straight weld steel plate to conduct the experiments. The performance of the detector is analyzed by comparing the sensitivity, resolution, SNR and other parameters according to the obtained results from the experiments and relevant standards. Comprehensive analysis found that this kind of detector was able to conform to the requirement of related standard of digital radiography on sensitivity and resolution. The results of study provide a reference in choosing a suitable detector for the construction of industrial CT systems or DR systems.