Abstract: The image file formed by CR (computed radiography) can be stored for a long time and displayed digitally. Its image quality is affected by many factors. The stability test during the use of the equipment is an important content of CR inspection quality control. The differences in the relevant requirements of the typical CR equipment long-term stability test in the standards of GB/T 21356-2008, ASTM E 2445-2014 and EN 14784-1-2005 were analyzed, and the ASTM (American society of testing materials) standard implementation method and acceptance index were expounded. What described in the paper can establish a standardized technical basis for the stability test procedure of CR testing equipment in the field of industrial nondestructive testing, and promote the popularization and application of CR testing technology.