The result showed that,when the sequence contents smoothly curve incompletely,not only GIM(1) grey model is better than GM(1,1) one in Whitening system variable and comparable with GSM(1) one,but also its information rate is higher.

• 初步应用表明，在序列不完全满足光滑化条件时，GIM（1）灰色模型对系统变量的“白化”能力较GM（1，1）强，而与GSM（1）灰色模型相当，信息利用率高，是分析、预测环保投资动态发展趋势一条切实可行的途径。