Cement-sand-gravel dam combines the advantages of low cost of earth rock dam and high safety of concrete dam，which can greatly improve the land utilization rate. In case of excessive flood，it will not break the dam and has a short recovery period，and the difficulty of rescue and disaster relief is greatly reduced. We summarize the advantages of current examples of cement-sand-gravel dam projects at home and abroad，simulate the diagenetic process of sand gravel by manually selecting cementitious materials and sand gravel for mixing，paving and rolling combining with the construction example of cement-sand-gravel dam project in the reservoir area of Qianwei navigation-power junction project in Minjiang River，test and analyze the engineering properties of synthetic cement-sand-gravel to determine the optimal mix proportion，and compare it with the engineering properties of natural calcium cemented cement-sand-gravel in Yele hydropower station. The results show that it is safe and feasible to use synthetic cement-sand-gravel to build dam，which can provide references for the similar projects.