As a new fashion river regulation building, the effect of pile permeable spur dike to flow and bed needed dependable quantitative research. Based on previous research, and combined indoor experiment, the characteristics of flow nearby pile permeable spur dike and the local scour were analyzed. The local water head loss of permeable spur was considered of superposition which included the water head loss of the current through spur like a water screen and the water head loss of main current cross section extending suddenly. The energy equation was built up based this, and the calculation formula for backwater height of the permeable spur was obtained. Based on this research, through the association theory analysis and experiment, this problem of scour depth was discussed in this paper. Superposed model of flow nearby spur was built firstly, and then the formula of spur head flow velocity distribution is derived. At last, a theory formula of scouring depth around 900 pile permeable spur dike was built. These formulas had explicit mathematical modes and physical conception, and the calculated result fitted the experiment data well. All the researches above could supply technical grounds to the design.
