灰色系统理论是基于关联空间、光滑离散函数等概念定义灰导数与灰微分方程，进而用离散数据列建立微分方程形式的动态模型，即灰色模型是利用离散随机数经过生成变为随机性被显著削弱而且较有规律的生成数，建立起的微分方程形式的模型，这样便于对其变化过程进行研究和描述。(The grey system theory is a relational space, smooth discrete function concept definition of grey derivative and grey differential equation based on the discrete data column to establish the dynamic model of differential equations, the grey model is the use of discrete random number generated through random number generation to be significantly weakened and more regular, in the form of differential equation the model set up, so it is easy to study and describe the change process.)