It can be seen from Tables 2~4 that the three-layer BP neural network prediction model predicts that the average relative error of the data set of the "A spun yarn" neps index is 10.63%, and the maximum relative error of the predicted data can reach 34.07%; it predicts the "B spun yarn" neps The average relative error of the data set of the indicator is 11.45%, and the maximum relative error of the predicted data can reach 33.97%; the average relative error of the data set of the predicted "C spun yarn" neps indicator is 18.97%, and the maximum relative error of the predicted data can reach 46.28% .