Abstract: By studying related projects, it is found that cement sand and gravel(CSG) makes use of natural gravel from river bed and excavated material of bank slopes, which is of advantages such as less usage of cementing material, no requirement for temperature control, relatively simpler construction technology. So, CSG adopted in construction of cofferdam is safe, high-speed, economical and environmental friendly. This paper introduced the application of CSG in Gongguoqiao hydroelectric project, mainly focused on the tests of mix proportion, construction technology and control. What's more, issues needed further research were advanced, for reference.