Grey relativity analysis is a theoretical method of grey system theory. 灰色关联度分析是灰色系统理论的一种理论方法。
Based on the AHP method and grey system theory, a grey hierarchy evaluation model is built up to evaluate energy conservation risks quantitatively. 运用层次分析法和灰色系统理论，建立从色层次分析评价模型对节能项目风险进行评估。
