Abstract: In recent years, the state has put forward higher requirements for ecological environmental protection of hydropower development, and the establishment of ecological environment supervision and management system in line with it is crucial for enterprises to self-certify and abide by the law and sustainable development. Environmental protection technology supervision in the grid, thermal power and other fields have more applications and research, but in the hydropower industry, especially in large hydropower project environmental supervision and management of the actual use and innovative methods of research is still relatively small. This paper systematically introduces the practical exploration and preliminary results of ecological environment technical supervision of large hydropower projects, deeply analyzes the main tasks of ecological environment technical supervision, and puts forward management innovation initiatives such as innovative technical supervision and management concepts, sound technical supervision and management system, informatization management technical supervision, establishment of closed-loop management mechanism of problems, and standardization management technical supervision. Taking China Three Gorges Corporation as an example, it shows the practical effectiveness of applying these management innovations, and based on the practical exploration, it puts forward the thoughts and suggestions for doing a good job of ecological environment technical supervision of large hydropower projects. The research results can provide useful reference for the supervision of environmental protection process of hydropower development.