This paper describes an innovative steel structure and installations forscouring prevention adopted in the spillway of the debris flow controlproject in Luhua Ravine of Heishui county,Sichuan province. The struc-ture is designed as, at the joint of lateral bottom and air face downstream the spillway of check dam, a 8-rocm thick steel plate was used to make a steel part which extrends out 50cm from the downstream air faceand rises 10-15cm, welded on double threading steel bar 25mm in diame-ter, it was casted into a steel bar-reinforced stopper,No. 200 in 50cm,connected with the check dam as a whole. Check dams with a spillwaystructured in this way can retain a layer of debris flow and play a role ofenergy dissipation and cushioning. When the following debris flows cro-ss the dam, the external force of direct scouring, friction, impact andundercut exerted on the dam by debris flow would be transformed intothe inner stress of stone against stone and sand against sand inside deb-ris flow, thus protecting the dam outled from the damage by debris flowwhich would cause the destruction of the whole dam.