与其他类型工程相比，水电梯级开发项目对环境的影响十分复杂，其所涉及的环境影响要素十分广泛。本文构建了3层次19个指标的梯级开发项目环境影响指标体系。基于主成分分析原理，利用SPSS软件中的“因子分析”功能进行指标降维处理，并用算例进行验证。算例中共提取主成分2个，第1主成分与8个指标呈正相关，与7个指标成负相关；第2主成分与2个指标呈正相关。%Compared with other types of engineering, the environmental implication caused by hydropower cascade development project is very complex, its environmental implication factors are very wide. This paper constructs the environmental impact index system with 3 levels and 19 indexes for the cascade development project. Based on principal component analysis, the"factor analysis"in SPSS software is used to carry out the indicator dimension reduction process and calculation examples are used to verify. There are 2 principal components in the calculation example, the first principal component has positive correlation with 8 indexes and negative correlation with 7 indexes; the second principal component has positive correlation with 2 indexes.
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