The grey system correlation analysis method is essentially the analysis of correlation coefficient. First of all, it starts from the correlation coefficient of a reasonable scheme composed of each scheme and the best index, and then makes ranking analysis according to the size of correlation degree, and draws a conclusion. It is better than the mathematical method. After conceptualizing and modeling the intention, viewpoint and requirement, the grey system gradually forms the elements with unclear black and white in structure, mode and relationship. This method is absolutely not allowed to be ambiguous in the existing mathematics, The principle is simple, the calculation is simple and the level is clear. It has great practical application value for the characteristics of data distribution type and correlation type between variables.<br>
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