The layout of a navigation-power junction must satisfy firstly relevant requirements of vessels passing through the dam. The layout of locks is the main factor of site selection and layout of the dam. Through some cases studies, the general requirements of site selection and layout of navigation dam are summarized. Both the straight reach and the curved reach in a river could be selected to arrange the navigation dam. The layout can be divided into two types: One is the concentrated layout and the other is the separated one. The focus of the former arrangement is the influence of discharge flow from the hydropower station and spillway on the lock, while the focus of the separated arrangement is the layout of the entrance area connecting the access channel to the lock and the river.