Because of the big difference of water level between the upstream and downstream of the water conservancy project，the terminal flow has huge kinetic energy，so some energy dissipation devices need to be set up to reduce the impact of the water flow on the river bed.With the existing hydro project in Xinjiang，hydraulics scale model test，adjust the different conditions，verify the set and not set the differential ridge of the pressure ridge in the corresponding flow conditions of the flow，the average pressure，the pick can effect，pick flow distance and pit depth effect，and ultimately determine the appropriate pick-up body type.The results show that although the diffusion of water tongue is not as good as the differential ridge after removing the differential ridge，there is no significant difference in the distribution of the average pressure at the bottom of the plunge pool.Finally，the energy dissipation mode without the differential ridge is adopted.Based on this，provide design basis for engineering design.