Abstract: As the clean and low-carbon energy, the nuclear power has become more and more important in achieving the dual carbon target. "The economic evaluation guidelines of the nuclear power plant construction project" (NB/T 20048-2011) is the main basis for economic evaluation of the nuclear power construction projects, but it has not been revised since its release in 2011. At present, the profound changes of nuclear power technology, industrial policies and market environment bring about new requirements for the 2011-edition standard. This paper proposes the contents and parameters that need to be optimized and adjusted in the 2011-edition standard from four aspects of economic evaluation parameters, nuclear-related costs, electricity market reform, and maintenance cost division. Moreover, the electricity price level before and after the parameter adjustment are calculated using the financial analysis method. Finally, a sensitivity analysis is made on four parameters including economic evaluation period, load factor, the extraction proportion of retirement fund, and the amortization period of the first furnace charge. The average generation cost decreases by 5% after parameter adjustment, and the economic period and load factor have more obvious impact on decreasing generation cost.