灰色系统理论提出了一种新的分析方法—关联度分析方法，即根据因素之间发展态势的相似或相异程度来衡量因素间关联的程度，揭示事物动态关联的特征与程度。(The grey system theory puts forward a new method of analysis, the method of correlation degree analysis, that is to measure the degree of correlation between factors according to the similarity or difference degree of the development situation among factors, and to reveal the characteristics and degree of the dynamic association of things.)