The article takes ground water guality as a grey system. By means of grey forecasting model GM (1, 1), the model establishment and its forecasting, of CGD and BOD_5 in a river segment aro done.

• 本文将地面水质视作灰色系统,对某河段的化学耗氧量(COD),生化耗氧量(BOD_5)用灰色预测模型GM(1,1)进行建模、预测。