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.
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.
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.
边坡系统是一类典型的复杂灰色系统，由于其位移监测数据离散程度较高，因此应用经典灰色预测模型往往会出现预测值偏差较大的情况。
Slope system is a sort of typical complex gray system, applying classical gray prediction model will engender large error in predicted value due to the high discrete degree of monitored displacement.
边坡系统是一类典型的复杂灰色系统，由于其位移监测数据离散程度较高，因此应用经典灰色预测模型往往会出现预测值偏差较大的情况。
Slope system is a sort of typical complex gray system, applying classical gray prediction model will engender large error in predicted value due to the high discrete degree of monitored displacement.
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