The study of floating offshore wind turbine has become a focus of wind turbine field, and moorings has important impact on the safety of floating wind turbine.The paper selected NREL 5MW floating wind turbine as object based on the Barge platform to study the influence of mooring parameters on the dynamic response of floating wind turbine and mooring stress.The result showed that the change of mooring diameter and length has greater influence on longitudinal shake and tension of mooring floating wind turbine,and has less influence on vertical swing and longitudinal shake;when mooring diameter is 0.3 m,the displacement offset volume of longitudinal swing reaches the maximum, the tension of mooring line top reaches the minimum;with the increase of mooring length, longitudinal swing displacement constantly increases, the tension of mooring line top constantly reduces.