In the comprehensive treatment of black and odorous water,dredging is an effective method to eliminate endogenous pollution.Reasonable determination of dredging depth is the first question to eliminate endogenous pollution.Through the visual stratification method,the content analysis method and the release experiment method,we analyze the pollutant content and release amount of Shahe River sediment.Finally,determine the excessive heavy metal pollution or TN content is 1，500 mgkg or TP content is 500 mgkg as the limit of sediment dredging control indicators.According to this standard, we determine that the thickness of the dredging is from 0.3 to 4.4 m.The total dredging of the sediment is about 371，700 m3,which can remove TN 1，848.75 t and TP 825.62 t,and effectively remove the endogenous pollution.It will provide better internal conditions for the ecological restoration of water body in the late Shahe River.