Morbidity Problem in Grey Model

This paper points out that the sysstem of equations of grey model(GM model)has very serious morbidity problem We discuss the reasons why GM model has morbidity problem:1)Matrices are composed of accumulating numbers which have very large scalar difference among them;2)Degeneration in some grey model makes very large scalar difference among elements of matrices;3)The way to build matrices in grey model let us hardly reduce morbidity of the system of equations A widely referrenced example is analyiedin this paper At the end,we suggest that it must be careful to use grey model