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根据各种应用实例的分析，指出对于同一原始序列来说，当计算零点升高、新序列的第二项减小或累加次数增多时，ＧＭ（１，１）模型的预测值增大，同时指出这些问题是由ＧＭ（１，１）模型本身的特点所决定的。
According to the analysis of various application examples, it is pointed out that for the same original sequence, the prediction value of GM (1,1) model increases as the zero point is calculated and the second term of the new sequence decreases or the number of times of accumulation increases. It is pointed out that these problems are determined by the characteristics of GM (1,1) model itself.