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