Most reservoir rapids between two dams of Three-Gorges and Gezhouba are canyon flood rapids.Adopting the conventional rapids regulation methods like enlarging the discharge area to renovate this rapids has many deficiencies,such as producing large quantities,being difficult to achieve better renovation effect and easy to cause localized landslip.Based on Shuitianjiao and Xitan rapids,we analyze the reservoir canyon flood rapids characteristics and limitations of conventional rapids regulation methods.