According to the geologic conditions of Jinggangshan navigation-power junction dam site, we put forward two arrangement plans of “lock and power plant at the same bank or different banks”.Under the principal of optimal flood control，navigation conditions, construction conditions and time limit for a project and project investment, we compare the general layouts and recommend the overall layout scheme, i.e., permanent lock at the left bank and power plant & fishway at the right bank.Using hydraulic integral model and ship model test, we study the key factors such as hub discharge energy dissipation, the navigation flow condition at the entrance area, power station flow condition of the recommended layout, demonstrate the general layout scheme and put forward improvement measures.The research process and conclusion may serve as reference for the general layout arrangement of low water head navigation-power junction.