This paper introduced the seismic design requirements of nuclear power plant, the seismic design situation of the unit in construction or in service, and the serious consequence impacted by earthquake. Then, it described in brief the measures on seismic analysis taken by countries who own nuclear power plants in the world after the Fukushima nuclear accident, and gave a particular introduction about the improvement taken by China Guangdong Nuclear Power Holding Co. Ltd. Finally, this paper presented some steps for the new nuclear power plants at the seismic design and evaluation to enhance the seismic capacity of nuclear power plants through technical means.