China Yangtze Three Gorges Project is a particularly giant hydro-development project in the world with enormous scale and complex technology. Coming through seventy years project planning, verifying and decision-making, this ten years construction practice has demonstrated that not only great progresses have been made within project implementation stage, but also most of conclusions from the verifications and decision-making stage are correct. Some problems like sedimentation, environment and resettlement is still waiting to be tested in the actual operation of the project. This paper provides a brief introduction to the decision-making and practice of the Three Gorges Project.