In July 2012, four intensive rainfall processes occurred successively in the Yangtze River Basin, leading to four floods. Among them, water level of the Zhutuo Rreach exceeded the maximum observed record; the Cuntan reach experienced the heaviest flood after 1981; the highest flood peak appeared in the Three Gorges Reservoir; water level in the reach from Yibin to Cuntan located in the upstream the Yangtze River exceeded the guaranteed stage; the water level in the reach from Shishou to Luoshan in the Dongting Lake exceeded the warning stage. During the process of flood regulation and control in July 2012, the Three Gorges Reservoir played an effective role in reducing the water levels by 2m in the Jingjiang reach and 1 m in the Honghu reach. Thus, the situation that water level in the Jingjiang reach approach to the guaranteed stage was avoided, and the length of the reach with water level exceeding the warning stage was shortened by more than 240km in the middle and lower Yangtze River, which mitigated the pressure of flood control in this area.