With the limitations of algorithm rule of interval grey numbers, the algebraic operations between interval grey
numbers will lead the results to be more and more greyer, so it is difficult to effectively build a grey prediction model based on interval grey numbers. Therefore, the interval grey number is divided into “white part” and “grey part” based on real number form by standardizing interval grey numbers, and grey prediction models are established. Then the prediction model of the primary interval grey number is deduced and reverted. Finally, this model is used to forecast the number of urban migrant workers and obtain an excellent effect, and the results show the effectiveness and practicability of the proposed model.