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以北京市潮白河密云水库以上流域汛期（６～９月）平均降水实测资料为例，应用灰色变基模型对１９８６～１９９４年９年历史资料作预测检验，预测值与实测值绝对误差均小于３０％，绝对误差小于１５％的有７年，效果较好。并以此法预测１９９６年、１９９７年未来二年密云水库以上流域汛期平均降水量，效果如何，尚待时间来检验。
Taking the mean precipitation data of flood season (June-September) over the Chaobaihe Miyun Reservoir in Beijing as an example, the historical data of 9 years from 1986 to 1994 were predicted and tested by using the gray base model. The absolute errors between predicted and measured values were less than 30%, the absolute error of less than 15% for 7 years, the effect is better. And this method is used to predict the average precipitation in the flood season above the Miyun Reservoir in 1996 and 1997 in the next two years.