结合南水北调东线一期工程治污历程，以规划水平年2000年为基准，以2002年—2012年为时间轴，分省、按区段对东线淮河片十年来主要污染物COD和氨氮入河量变化情况进行了分析。结果显示，通过结构减排、工程减排和管理减排，东线沿线污染负荷削减显著，在“十五”期间基本遏制主要污染物入河量过快增长的基础上，“十一五”沿线污染负荷呈大幅下降趋势，2010年沿线污染负荷总体达到规划控制目标要求，2012年治污减排效果得到进一步巩固，为2013年东线一期工程通水奠定了坚实基础。

According to the pollution control process of the first-stage construction in the Eastern Route of South-to-North Water Diversion Project, the amounts of COD and ammonia discharge into the rivers in the Huaihe River Basin were analyzed from perspective of provinces and sections from 2002 to 2012 based on the planning year of 2000. The results showed that the pollution loads decrease significantly due to structural, engineering, and management discharge reductions. During the 10th five-year plan, the excessive growth of main pollutants discharge into the river was controlled within limits along the Eastern Route of South-to-North Water Diversion Projection (SNWD). Therefore, during the 11th five-year plan, pollution load along the route showed a substantial decline. The pollution load along the route reached the overall planning control objective in 2010 and pollution control and discharge effects had been strengthened in 2012, which laid a solid foundation for the water service of the first-stage engineering project in the Eastern Route of SNWD in 2013.