Abstract: Carried out an experimental study on the hydrodynamic effects of permeable trapezoidal reef clusters on tsunami waves from non-flat island reefs, the effects of water depth, row number and pore diameter of permeable trapezoidal reef group on the wave attenuation capacity of different incident waves are analyzed. The results show that the wave shallower deformation is enhanced by the permeable trapezoid reef group, which leads to the increase of local wave height and steep wave deformation, and the increase of wave breaking strength on the reef flat, with the increase of the pore diameter of the reef, the transmission coefficient increases and the reflection coefficient decreases. As the number of reef rows increases, the transmission coefficient decreases significantly when the incident wave is small, while the reflection coefficient increases with the number of rows. In the case of large incident waves, the transmission coefficient decreases slightly with an increase in the number of rows, and the change is not significant, while the reflection coefficient shows an unchanged upward trend with an increase in the number of rows. The results of the physical test can provide reference for numerical calculation and design of offshore protective structures.