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对轴流泵和导叶式混流泵ｎＤ值的计算公式进行了分析和推导，指出它与水泵能量和汽蚀特性之间的联系，列出了正常情况下水泵ｎＤ值的取值范围。
The formula of nD of axial-flow pump and vane-type mixed flow pump is analyzed and deduced. The relation between it and the pump energy and cavitation characteristics is pointed out, and the nD value range of the pump is listed.