This paper designs a new and scientific environmental quality assessment method, and takes Saihan dam as an example to explore the environmental improvement degree to the local and Beijing areas. AHP method is used to assign values to each weight 7 primary indicators and 21 secondary indicators were used to establish an environmental quality assessment model. The conclusion shows that after the establishment of Saihan dam, the local environmental quality has been improved by 7 times, and the environmental quality in Beijing has been improved by 13%. Then the future environmental index is predicted. Finally the Spearson correlation coefficient is analyzed, and it is proved that correlation is 99% when the back-propagation algorithm is used to test and prove that the error is little.

翻译：本文设计了一个新的科学环境质量评估方法,并将赛汉大坝作为探究地方和北京地区环境改善程度的范例。使用AHP方法为每重7个初级指标分配值,使用21个二级指标建立环境质量评估模型。结论显示,在赛汉大坝建成后,当地环境质量提高了7倍,北京的环境质量提高了13 % 。然后预测了未来环境指数。最后,分析了Spearson相关系数,并证明,在使用后方调整算法测试并证明错误很小时,相关系数是99%。