中文摘要：

基于已有灰色建模的思想,分析了反向累加序列特点及建立GM的方法,一定程度上改进了预测结果。通过两个沉降监测序列实例,表明了其特别适合于多次累加序列的灰色预报。

英文摘要：

Based on the idea of gray model,we put forward the process and improvement methods of GM modeling through reverse accumulation,to improve the prediction results.Two examples demonstrate that the improved method is particularly suitable for accumulation many times for gray prediction.