From the grey model of the gross value of industrial output of Anshan over the years, We can forecast the gross value of industrial output of 1990, the forecasting error is 10. 99%.

• 通过建立鞍山市历年工业总产值全数据的灰色模型；较准确地预测出鞍山市1990年的工业总产值；其预测误差为10.；99%25