Scaffolds constituted with three poles which are used to protect the coast and breakwater gain a very good protection effect on account of their unique characteristics that poles which constitute the scaffolds can disturb the flow pattern and consume flow energy.In order to explore the feasibility and the effect of scaffolds constituted with three poles for the scour protection as a new kind of beach protection measures，the flow structure near the protection system is measured in the process of carrying out the flume experiment.The effect of scaffolds constituted with three poles for three dimensional velocities and turbulence intensity distribution is analyzed.By comparing the longitudinal distribution of energy of unit mass of fluid near the riverbed with the protection system or not,the protection mechanism of scaffolds constituted with three poles for river bank is concluded.