In recent years,more and more sand mining projects are carried out in Chengtong river reach,which may cause riverbed erosion or siltation,and bring adverse effects on waterway and navigation safety.Taking Fushan waterway south shore beach restoration project for an example and based on the latest mapping data and hydrologic data,this article analyzes the river back silting situation after sand mining,and discusses waterway and navigation safety.The result may serve as reference for follow up projects in the local reach.