After the evaluation of water quality and analysis of pollution source of Baishui River in Jiuzhaigou, the aquatic environment capacity is calculated using section-beginning control model.

• 摘要以九寨沟县白水江为研究对象，在水质现状评价以及污染来源分析等基础上，采用段首控制法对其进行水环境容量计算。