Abstract: The reference standard of GB/T 9711-2017 standard on digital radiography testing is SY/T 6423. 5-2014. When steel pipe is produced according to GB/T 9711-2017 standard, SY/T 6423. 5-2014 standard or other international standards shall be implemented. However, according to the relevant provisions of special equipment, what the NDT personnel of pipe factory learnt during its training and certification was often the NB/T 47013. 11-2015 standard. Although these two standards are both about digital radiography testing, there are differences in some aspects. The similarities and differences between NB/T 47013. 11-2015 and SY/T 6423. 5-2014 are compared and analyzed, so as to provide reference for the inspectors in the pipe making plant to deeply understand and use the standard and correctly implement the standard.