Abstract: Disorderly sand mining in rivers leads to drastic changes in the riverbed of Bengbu section of the Huaihe River.In order to analyze the impact of sand mining on river regime stability and river flood control safety in this section, the impact of sand mining in Bengbu section was studied.Based on the characteristics of water and sediment in the river channel and the law of river bed evolution, the impact of river sand mining was evaluated from the aspects of embankments and beaches, hydrological stations, water conservancy projects, bridges and pipelined, etc.And the range of river channel needed to be protected in Bengbu section was proposed.The results show that:(1) Before 2008,the natural evolution of the section from Bengbu Gate to Mohekou, the main stream of the Huaihe River, was slow and the riverbed was relatively stable.After 2008,the disorderly sand mining caused drastic changes in the riverbed, and it was difficult to recover naturally for a long time.(2) Sand pits have the characteristics of large number, large depth, steep slope and extremely unstable, which can easily lead to section sliding and uneven riverbed, affecting the hydrological test work, endangering the safety of flood control and the management of other river-related facilities.(3) According to the requirements of river management, within the scope of the two embankments of mainstream from Bengbu Gate to Mohekou Section, the area to be protected accounts for more than 95% of the total area, that is, there is no sand-mining area in the Bengbu section of the Huaihe River, so it is required to be designated as a sand mining prohibited area.The research results can provide a basis for sand mining planning, river channel protection management and water conservancy project management in Huaihe River.