Abstract: In order to allocate NPP equipment management and maintenance resources reasonably, improve the reliability of equipment, ensure the NPP safe and stable economic operation, the classification management has to be carried out for the equipment of NPPs. This paper studied the reliability of equipment classification method based on AP913 equipment reliability management system, and eventually developed a new classification process which was different from the classical RCM and Streamlined RCM. Based on this method, the 205 systems of equipment classification work has been completed in a domestic nuclear power plant successfully.