Cultural eutrophication is the Earth忆s most widespread water quality problem, causing harmful algal blooms, fish deaths, underwater plant deaths, decreasing biodiversity, reduction of water clarity, and many other related problems.Southern Jiangsu Province ( SJP) , which is by far the most densely populated and most developed area of the east of the People忆s Republic of China, has in total 11 shallow lakes with a surface area ranging from 10km 2 to 2,428 km 2 and an average water depth of less than 2.5m. Unfortunately, accompanying the fast economic development in SJP is the serious deterioration and eutrophication of the water environment, with high levels of algal biomass, frequent algal blooms and low water clarity, which are threatening both the water supply to these regions and their economic development. In this article, in order to investigate the eutrophication features and differences in state of 11 lakes within the same geographic area, we obtained 1090 field monitoring data sets of potassium permanganate index ( COD Mn ) , ammonia nitrogen ( NH 3 鄄N) , total phosphorus ( TP ) , total nitrogen ( TN ) , algal Chlorophyll鄄a ( Chl鄄a ) and Secchi depth ( SD ) of lakes from the environmental monitoring agencies attached to the EPA of Southern Jiangsu Province. All water samples were collected

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