Transient process calculation is the basis of regulation guarantee design. Taking the transient process calculation in feasibility study of a domestic pumped storage power station as an example, the effects on the transient process calculation results exerted by the following factors are calculated and analyzed through Hysim:draft head, runner model characteristics, diameter of tailrace tunnel, generator-unit's moment of inertia and closure law of guide vanes. It is founded that the draft head and runner model characteristics have more significant impact on the transient process calculation results. As the draft head and the station layout can be basically determined in feasibility study while the characteristics of the generator-unit developed by different man-ufacturers are variable, so concern should be attached to the characteristics of the generator-unit in its bid invitation so as to meet the demand of regulation guarantee design.%过渡过程计算是调节保证设计的一种计算手段，也是调节保证设计的基础。以国内某抽水蓄能电站可行性研究阶段的过渡过程计算过程为例，通过利用Hysim软件，计算分析了电站吸出高度、转轮模型特性、尾水洞洞径的大小、机组转动惯量以及导叶关闭规律等因素对过渡过程计算结果的影响。分析结果表明，电站吸出高度和转轮模型特性对过渡过程计算结果影响更为显著；由于电站的吸出高度和枢纽布置方案在可研阶段基本上已经确定，而不同厂家研发的机组所具有的特性又各不相同，因此，在实施机组招标时，应重视机组特性对过渡过程计算的影响，以满足调节保证设计的要求。
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