It was studied that the water quality of 12 Spare Drinking Water Resources in Chongqing City,and the eutrophic state of these resources by using the comprehensive nutritive index.

Combined the physical,chemical and biological index,using the Margelef multiple index and trophic state of comprehensive index(TSCI),the qualitative analysis and investigation of the water body quality of the subsidence pool are carried on in Huainan mining area,the inherent laws of water quality variation are discussed.

The water eutrophication level were evaluated with using comprehensive nutrition state index in this paper, the results showed that the Yunlong Lake was on light eutrophication level.

The eutrophication condition of the Shangtang pond was evaluated by the methods of comprehensive nutrition state index.

The correlation between chlorophyll-a and other environmental factors was analyzed in this paper, based on the monthly monitoring data in Shanzi Reservoir from March to November in 2003, and modified Carlson trophic state index was also calculated for assessing the water condition of Shanzi Reservoir.

The water eutrophication in Shahu Lake was evaluated comprehensively by using trophic status index in this paper.