Since the impoundment of Three Gorges Reservoir in 2003, the construction schedule, resettlement and geological hazard treatment were ahead of those in the preliminary design. The sedimentation conditions were obviously better than expected, and the goal of stage-by-stage impoundment was achieved in advance. Simultaneously, with the changes in operating conditions, optimum operations such as floating control of flood limit water level, medium and small flood regulation and impounding in advance were carried out, which produced enormous comprehensive benefits in flood control, drought relief, navigation, water supply and ecology. Especially during the flood season in 2010, the flood retention and storage capacity reached totaled 26.6 billion m³ through medium and small sized flood regulation, and the flood resources were fully utilized. In the end of the flood season, the flood resources were fully utilized and the water lever reached 175 m first with the joint operation of flood control and water storage. Then the project began to give full play to its comprehensive benefits during the normal operation period.