By using the geo-acumulation index and Hakanson potential ecological risk index,anaylsed the heavy metal material-Cadmium in the dediments of 18 samples collected from streams and rivers. The results showed that Cadmium pollution is serious in stream and rivers. The pollutants are more serious in the upstream than in the downstream. The section of Xinqiao to Gaotanyan received heavy metal cadmium, which has the extremely high ecology risk to the environment. The sample collected from the main stream which cadmium concentration between 0.38～1.48mg·kg~(-1), mean value is 0.88mg·kg~(-1),The sample collected from the branches showed cadmium concentration between 0.51～1.08mg·kg~(-1). The degree of Cadmium's pollution and potential ecological risk of the Qingshui stream branches sorting from high to low: Yangjia ditch > Jinzhu ditch > Bajiao ditch > Guanjing ditch > Shinianpan ditch.%采用地累积指数和Hakanson潜在生态风险指数法,通过分析清水溪18个采样点底泥中典型重金属镉的含量,定量确定了清水溪底泥中重金属镉的污染程度和潜在生态风险程度.结果表明,清水溪流域镉污染比较严重,上游比下游污染严重,而且在新桥到高滩岩段受到重金属镉的中强度污染,对周围环境存在极高的镉生态风险.在清水溪干流上采样点底泥中镉的质量浓度范围在0.38～1.48mg/kg之间,平均值0.88mg/kg,各支流底泥中镉的质量浓度范围为0.51～1.08mg/kg.对于清水溪各支流镉的污染程度与潜在生态风险程度由高到低的排序为杨家沟>金竹沟>芭蕉沟>关井沟>石碾盘沟.
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