Abstract: The new edition of national standard, GB/T 9445-2015 Nondestructive Testing-Qualification and Certification of NDT Personnel, made a few of changes for some terms. Terms defined by the standard are possibly used by other standards and are also used in the field of NDT. Correct understanding and application of the terms in the standard is related not only to certification of NDT personnel, and is also fiurther related to the effective work of nondestructive testing. The interpretation of the new version of the national standard for nondestructive testing personnel certification can help NDT colleagues to better understand the standard.