分析了灰色预测模型GM（1，1）和离散灰色预测模型DGM（1，1）两者之间的关系，讨论了模型预测的准确性和稳定性。

The relationship between the grey model(GM(1,1) model) and the discrete grey model(DGM(1,1) model) is analyzed, and their prediction precisions and stabilities are discussed.

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结果：离散函数的近似函数就是灰色模型的传统函数。

Result: the approximate function of the dispersed function is a traditional function of the gray model.

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由于离散函数的导数不存在，因此，如何处理导数信号，是建立灰色模型的关键。

The derivative of dispersed function doesn't exist, so that, how to deal with the derivative is the key to set up grey model.

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