Change and Development on Comprehensive Index of Urban Water Environment Quantitative Evaluation

It was analyzed that change had happened in definition,meaning,content and classification of monitoring index,weighed values and assessment criteria of urban water environmental water quality from period of the 9th of five-years national economic and social development plans to the 11th of five-years national economic and social development plans.It made suggestion that indicator selection of environmental quality should reflect current environment pollution situation and to list heavy metal and other environmental priority pollutants as evaluation index of water environment quality monitoring as well as new principles for index screening and ideas for indicator design.