Abstract: Compared to the unpervious slab, the pervious slab can improve the stability of protective structures through the reduction of hydrodynamic stresses. In order to better understand this new type of protective structures, an experimental study of the fluctuating pressure on pervious slab is carried out in a stilling basin under jet flow from tail-flaring piers. The fluctuating pressure is imposed on both sides of the pervious slab. Measurements are made on the variation of fluctuating pressure along the longitudinal direction, the density distribution of fluctuating pressure, the time-space relationship between the top and the bottom of the pervious slab, the integral scale, and the power spectral density. The experimental results and the subsequent discussion on the decompression mechanism of pervious slabs provide valuable references for the design of pervious slabs.