Abstract: Dengchi gully located in the Baoxing county, Sichuan province. Several large mud rock flows occurred in history here. In this paper, according to the relevant achievements in scientific research domesfically and abroad, and the defail characteristics of Dengchi gully debris flow, The velocity of flow, the discharge and the punching power of the debris flow were analysed. The study has important actual significance on evaluating the influences of Dengchi gully debris flow to Baoxing hydroelectric power station.