Since the impoundment of the Three Gorges reservoir,Lujiahe waterway had been significantly eroded as the result of branch water from the reservoir.In recent years,the inlet of Shahong branch begun to deposit and formed a new shoal gradually,with the change of river boundary conditions,hydrodynamic condition and the incoming water and sediment condition.We analyze the channel morphology,hydrologic and sediment regimes,scour and silting evolution and beach distribution variations of Lujiahe waterway,based on which,we explain the deposition mechanism of Shahong inlet.Finally,we forecast the variation of sediment scouring and silting,beach morphology and river flow conditions in Shahong inlet area of Lujiahe waterway.