Abstract: The output capacity of steam turbine generator sets directly affects the economic benefits of power plants. In today's increasingly competitive power generation industry, ensuring that the unit's output meets standards and even further tapping the unit's potential to exceed design standard generation is crucial for improving the economic efficiency of power plants and their competitiveness in the industry. This article analyzes the reasons for the output decline of the Fuqing nuclear power unit 1 steam turbine generator set through calculations and comparisons of its main parameters and the performance of major equipment, and further provides methods and suggestions for enhancing unit output. While improving the economic efficiency of power plants, it also offers a clear direction and reference for the subsequent output enhancement and transformation of Hualong units.