Using swing wave-making device to exert wave loading,a model test is conducted to study the deep-water group piles.Simulating different scour depths by excavating the pile-surrounding soil,we probe into the dynamic response of the pile foundation at different depths under the wave action.Parallel contrast tests of single pile foundation at the same parameters are also conducted for a comparison.The results show that the natural frequency of deep-water structure is changing during the vibration.As the scour depth increases,the natural frequency of pile decreases,and the acceleration and displacement of the pile top also increase.At the same time,these responses increase with the increasing depth of water.In design,both piles’ scouring damage degree and hydrological condition should be considered.