Abstract: The paper introduces nuclear power plant （NPP） safety inspections, actions of re-evaluation and the main conclusions of the main countries with nuclear power in the world after the Fukushima Daiichi NPP accident. Countries, such as France, the United States and China, carried out the NPP safety inspection and re-evaluation action, and acquired conclusions. These countries respectively put forward the suggestions, demands and actions about improving NPP safety, and also formulated the specific engineering measures. The safety improvement actions, such as fortification in extreme external events, severe accident prevention and mitigation, water, electricity and ventilation physical improvements, limiting the radioactive release of severe accident, emergency preparedness, and so on, will increase the safety level and enhance ability to alleviate the severe accident of NPP. The profound consideration about the Fukushima Daiichi NPP accident, summarizing the promotion role of nuclear power safety technology improvement after the Fukushima Daiichi NPP accident, and the development of nuclear power safety technology in the future were discussed.