At present，the cemented gravel dams of domestic and foreign engineering examples all use rock foundations as the foundation surface. There is no precedent for the construction of cemented gravel dams on the foundation of sandy gravel overburden. Combining the example of the flood control embankment project in the reservoir area of the Minjiang Qianwei navigation-power junction，this paper uses the material mechanics method and the finite element method to explore the design of cemented gravel dam on the sandy gravel foundation. The cross-section design，stability and stress analysis，dam structure design and anti-seepage design，etc. are carried out，and a foundation treatment plan for building a cemented gravel dam on the foundation of a deep sandy and gravel is proposed.