By taking Zhuyin Reservoir in Zhuhai as the research object and directing against the pollution problem of reservoir flowing,the main pollutants and total pollution loading were analyzed and the pollution status was evaluated.Moreover,the water environmental capacity was assessed.The results reveal that N and P concentrations are relatively higher,while concentrations of other pollutants are not high.The water environmental capacity for each pollutant is large,which for Chloride is the largest and for heavy metals are relatively small,indicating the water is of good quality and the pollution receiving ability is strong at early period of water storing.All the results provide primary data for pollution control and reasonable dispatching models for reservoir management to achieve the safe water supply.