Abstract: The characteristics of digital radiography, and indicators and process requirements of digital radiography in ISO17636-2 are discussed in this paper, in which we focus on three principles of compensation, the determination of the minimum gray value, the roles and significance of geometric enlargement. And some experiments were done to verify and acknowledge the relevant provisions of the standard. Barriers and solutions of industrial application of digital radiography technology are analyzed. In the end, the trends of digital radiography are discussed.