For the problem that information of the interval grey number can not make full use of decision information, on the premise of information without losing, the interval grey number is decomposed into real type sequences of“white sequence”and“grey sequence”, and the whitenization of interval grey numbers are studied based on the information decomposition method. If the index weights are interval grey numbers, the optimization model is constructed to determine weights by defining the interval grey number deviation degree and close degree. The grey correlation between interval grey number sequences is established based on the TOPSIS theory. Then the consistency coefficient of the grey incidence decision-making model is proposed.Finally, an example is given to illustrate the feasibility and effectiveness of the proposed model.