中文摘要：

根据1997～2006年的水质监测结果，选用4个主要污染指标，采用综合污染指数法分析瓜径港近10年来水质状况及变化趋势。结果表明：瓜径港水质在这10年来基本呈恶化趋势，导致污染加重的主要因子是氨氮、总磷、高锰酸盐指数。主要原因是太湖流域经济迅速发展，人口猛增，用水量和工业、生活污水排放量增多，尤其是生活污水得不到有效处理，化肥、农药的使用和过量水产养殖也是水环境恶化另一原因。预计未来随着经济发展，瓜径港水体污染还会加重，所以必须严格控制污水排污量和建立完善污水处理系统。

英文摘要：

Basted on the monitoring data in Guajinggang River from 1997 to 2006, the water quality and its changing trend are analyzed by means of the integrated pollution value method selecting four main pollutants. The results show that the water quality in Guajinggang River had become worse during the past l0 years, and the main pollutants which caused aggravating pollution were NH3 -N, TP and CODMn,. The main reason was the quickly increase of population caused by rapid economic development, the water consumption and the emissions of life and industrial increased, in particular, domestic sewage was not effectively treated. Excessive use of fertilizers and pesticides was another reason for the deterioration of water environment. environment will be worse, so it is imperative and improve the sewage treatment system. With the economic development in the future, water to control the volume of sewage strictly and establish and improve the sewage treatment system.