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本文采用准三维计算方法分析了国产二十万千瓦汽轮机在运行工况条件下的高中压缸气动热力性能.S1计算分析了叶型表面等摘马赫数分市情况及叶型的性能，S2计算得到了沿叶片高度的气动热力参数分布并分析了主要的通流性能参数，最后为改造设计提出了若干建议．
In this paper, the quasi-three-dimensional calculation method was used to analyze the aerodynamic performance of high-pressure cylinder under the operating conditions of a 200MW domestic-made steam turbine.S1 calculation and analysis of the equational Mach number of the surface of the blade surface and the performance of the blade type, S2 calculation The aerodynamic parameter distribution along the blade height was obtained and the main parameters of the flow performance were analyzed. Finally, some suggestions for retrofit design were put forward.