Applying augmented reality to a work support system is expected to decrease human errors when practicing the maintenance of equipments of nuclear power plants. It is necessary to establish the indices to evaluate the system from the viewpoint of human centered design in order to develop such a system. In this study, therefore, the authors investigated the applicability of some indices to evaluate the system. As a result, it was revealed that task completion time and the score of NASA-TLX are appropriate indices.