Abstract: Taking the OC4-DeepCWind semi-submersible wind turbine floater and NREL’s 5 MW wind turbine as the research target,considering the shallow water environmental conditions and tidal effects,this paper carries out the hydrodynamic analysis of the floater and the design of the mooring layout scheme,as well as the coupled dynamic response analysis of wind turbine-floater-mooring system.The results show that under shallow water conditions,the hydrodynamic characteristics of the floater and mooring restoring stiffness are significantly affected by water depth,and the increase of the relative velocity between the structure and the seabed will also have a serious impact on the safety performance of the structure when the ratio of the water depth and structure draft is too small,which needs to be specially considered in the structural design stage.