Eutrophication,and the resulting proliferation of phytoplankton has became a serious problem of Shibianyu reservoir.In order to make effective protective measures for reducing contaminant levels of Shibianyu reservoir,the dynamic characteristics of nutrients and its source was investigated from January 2011 to August 2012.The results showed that total nitrogen concentration of shibianyu reservoir exceeded the specified 1.0 mg/L by the raw water quality standard all the year round with a annual average concentration of 2.8 mg/L,and the maximum concentration reached 5.1 mg/L in spring.Total phosphorus concentration exceeded the specified 0.05mg/L by the raw water quality standard mainly concentrated in the mixed period of winter and the period of incoming runoff was growing rapidly.