In the hydraulic engineering, reasonable choice of dam type can not only make every hydraulic structure exert high performance, but also can ensure the economy of the project. Taking Taihu Reservoir Project in Xunwu County as an example, concrete face rockfill dam and clay core dam, were selected based on practical engineering conditions. They were selected from the dam line project, engineering site, topography and geological conditions, natural building materials, and the project investment. Finally, determine to use the concrete face rockfill dam program as the construction of the project, Which can provide a reference value for the construction of similar projects.