In order to adapt to the need of high head flood discharge, a new type of water outlet can be put forward, which is the submerged jet and horizontal cyclone. In this paper, the body design of the energy dissipation work was carried out with flow rate of 1200 m3/s and the maximum total effect of water head 150m. Then, a hydraulic model test was carried out on the designed energy dissipater under geometric scale of 1∶60.25. The results show that there are many kinds of water flow patterns similar to the open channels, and the water flow coefficient of the water jet is 0.5-0.56, and the flow coefficient of the rotator throat is between 0.32-0.35. The diameter of the swirl cavity firstly increases and then rapidly decreases finally stabilizes. and the cavity diameter of the cavity is rapidly increasing and finally becomes stable. When the downstream water level H is less than 2.0 D, the pressure of the downstream swirl tunnel is relatively small, and when H is greater than 2.0 D, and the upstream and downstream water level has a greater influence on the pressure of the cyclone hole. The change of upstream water level does not affect the relative change of submerged jet velocity, and the change of the downstream water level influences the horizontal rotation tunnel. Upstream submerged jet flow energy dissipation, vertical shaft energy dissipation and swirl tunnel energy dissipation, and the downstream cyclone blockage dissipation accounted for 15%, 10%, 30%, 10% of the total energy dissipation rate, of which the downstream horizontal swirling flow sections bear the main dissipating part.