Abstract: Based on the model test of wave flume section, the effects of single row triangular cone permeable circular-hole reef dams at different design water levels on wave attenuation, topographic evolution of sandy beaches and movement track of bottom water particles were studied. From the analysis of test data, it can be seen that artificial reef dams have great influence on wave height reduction, wave surface shape and wave climbing; artificial reef dams weaken the hydrodynamic strength of the shelter area, weaken the wave sediment carrying capacity, promote the deposition of supersaturated suspended sediment behind the reef, and prevent the offshore loss of bottom sediment by resisting the offshore velocity of horizontal movement of water particles. To a certain extent, the experimental study reveals the characteristics of wave dissipation and current blocking of artificial reef dams and the response law of sandy beach topography, which can provide a scientific basis for the application of artificial reef dams in sandy beach protection.