It can be seen from the gray correlation analysis that the larger the correlation value of the two sequences, the higher the degree of closeness between the two sequences, so the input factor with a large gray correlation value between the input factor and the output factor has a greater impact on the output factor, The gray correlation coefficient between the input factor of each spun yarn variety and the yarn neps index is shown in Table 1.It can be seen from the grey correlation analysis that the greater the correlation value of the two sequences is, the higher the connection degree between the two sequences is. Therefore, the input factor with the larger grey correlation value between the input factor and the output factor has a greater impact on the output factor. The grey correlation coefficient between the input factor of each spinning variety and the yarn nep index is shown in Table 1.