There is about 34 km non-connection channel between Guiping navigation junction and Changzhou hydro-junction in Xijiang channel.Jiangkou building stone ground supplying material for the construction of Datengxia hydro-junction is as the reservoir end of Changzhou junction and near the upstream reach.To study the impact on the upstream hydraulic navigation environment induced by the sand mining project，we simultaneously consider the upstream flow and downstream reservoir water level variations，establish the 156 km two-dimension numerical model from three river mouths of Guping to Changzhou junction including the upstream 16 km Qianjiang river and Guiping junction，and analyze the impact on waterway hydraulic condition by sand mining project.The results show that since the sand mining project，the upstream water level of entrance area at approach channel decreases 0.09 m，mainstream in the reach of Bulingsha is altered left because of the beach mined.Generally，except the designed discharge，the impact on the waterway hydraulic environment induced by sand mining in reservoir end is relatively small.