[en] Paper describes the basic concept of nuclear power plant fitness for duty, analyzed the importance of nuclear power plant fitness for duty, its range of application. Its role and value in nuclear power plant safety management and human factor performance enhancement. Comparative analysis of evaluation policies, methods and management procedures on fitness for duty adopted by American NPPs. Identify gaps in fitness for duty evaluation and management positions between Chinese NPPs and overseas counterparts. Eventually recommendations for improvement are proposed for the reference of domestic nuclear power managers. (authors)