In order to technically prevent storms and floods，reduce the economic loss of life and property，the study make use of rainfall data，runoff data and storage data of reservoir.The study analyzes the rainstorm-flood process，rainstorm-flood characteristics，the flood regulation of reservoir，and puts forward suggestions for the flood control.The research shows that the main factors of the disaster are the heavy intensity and wide coverage of rainfall，and some medium-sized rivers have super historical floods.At the same time，flood-discharging，flooding peak clipping and flood peak staggering to reduce disaster losses．