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The floating offshore wind turbine(FOWT)is widely used for harvesting marine wind energy.Its dynamic responses under offshore wind and wave environment provide essential reference for the design and installation.In this study,the dynamic responses of a 6MW Spar type FOWT designed for the water depth of 100 m are investigated by means of the wave tank experiment and numerical analysis.A scaled model is manufactured for the experiment at a ratio of 65.3,while the numerical model is constructed on the open-source platform FAST(Fatigue,Aerodynamics,Structures,and Turbulence).Still water tests,wind-induced only tests,wave-induced only tests and combined wind-wave-current tests are all conducted experimentally and numerically.The accuracy of the experimental set-up as well as the loading generation has been verified.Surge,pitch and heave motions are selected to analyze and the numerical results agree well with the experimental values.Even though results obtained by using the FOWT calculation model established in FAST software show some deviations from the test results,the trends are always consistent.Both experimental and numerical studies demonstrate that they are reliable for the designed 6MW Spar type FOWT.