以钦江青年水闸断面为研究对象，采用2001年-2009年的水质监测数据，计算了污染最重的氨氮、溶解氧和石油类3项污染因子的污染指数（Pi）及断面的综合污染指数（Pj）。通过分析得出，钦江青年水闸断面氨氮污染指数在2004年-2009年基本维持平缓，溶解氧和石油类污染指数在2001年-2006年期间上升幅度比较大，在2007年-2009年，逐步下降并且持续平缓。水质综合污染指数在2003年和2006年分别达到了5．440、4．940，断面水质属轻污染级别，2007年-2009年青年水闸断面的综合污染指数基本保持稳定（〈4），河流水质的年际变化不大。%Taking the Youth Sluice of Qin Jiang River as research object, this paper adopted the water quality monitoring data from 2001 to 2009, calculated indexes including, pollution index （Pi）, section integrated pollution index （Pj） of NH3-N, DO and petroleum, which were the most polluted. From the characteristics of the changes of water pollutions indexes of Youth Sluice of Qin Jiang River, the ammonia pollution index remained fiat base in 2004 and 2009, DO and petroleum pollution index had a relatively large rise in the period from 2001 to 2006 and gradually declined and continued gently in 2007 - 2009. The integrated pollution index reached 5.440 and 4.940 respectively in 2003 and 2006. The section of water was slightly polluted, it remained stable （〈 4） in 2007 -2009 while the inter-annual variation in river water quality was only a little.
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