With regard to the morbidity of NGM(1,1,??) model, this paper takes the conditions of matrix as a tool to measure
the morbidity of the model and analyzes the value of conditions of coefficient matrix with the background value of this model
in three different cases, respectively. The results show that only when the original data sequence is a nonnegative constant
one, this model appears to be a serious morbid problem. However, in this case, the grey prediction modeling is meaningless.
Finally, an illustrative example is adopted for demonstration. The study conclusion shows that NGM(1,1,??) model has no
morbidity.