Abstract: Using Delft3D online coupling,the Delft3D FLOW and WAVE modules are coupled to establish a three-dimensional bidirectional wave-current coupling model in the sea of Zhaitang Island,and the impact to the waters due to the operation of a turbine was emulated by adding a momentum loss term in the equations of the model. Then,the influence of the tidal current turbine array on the regional tidal field is studied under the environment. The results show that:after the turbine array is placed,the water level change in the regional sea area can reach up to 2 cm,and the flow speed can reach up to 0.4 m/s. In the wave-flow coupling environment,the water level and flow speed of the coastal area and the intersection of the water flow through the turbine array and the strait change greatly,and the surface and middle flow speed changes are more obvious. The tidal level change caused by the waves is about 1 cm,and the surface and middle flow speed changes are about 0.25 m/s.