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Abstract: How to accomplish the assessment of environmental quality and its quantitative? How investments in environmental protection affect environmental quality? Such issues were hot in environment protection. This paper do an empirical analysis with data of Chongqing from 1996 to 2009 based on Set Pair Analysis methods, the results showed environmental quality from 1996-1998 were “worse”, the quality in 1999 and 2000 were “qualified”, the quality were “better” from 2001-2006 and were “good” in 2008 and 2009. And then, the paper unified the correlation of each level into a coordinate system in order to quantitative value of environmental quality. Through the analysis of relationship between investment in environmental protection and environmental quality, it was found that 1% changing of environmental protection investment could cause 9% changing of environmental quality. In addition, changing rate of environmental quality has lagged 1 year compared with changing rate of environmental protection investment. [Copyright &y& Elsevier]