Tension leg platform is one of classical supporting structures for floating wind turbine. The motion and tension response of the tendon is crucial to be estimated accurately in the detailed design stage. In this study, the floating structure model has been established considering several sources related to wind turbine. Thus, the aerodynamic analysis model, hydrodynamic model and numerical model for mooring tendons have been set up and the coupled effects have been taken into account. The aerodynamic model is based on the blade element momentum theory. The panel model of the platform has been established based on the classical potential flow software i.e. Hydrostar, and the mooring tendons has been modelled based on the lumped mass method. Several cases are designed considering the wave loads extracted from the metocean data report. One tendon sudden failure case is the focus of the present work, the enlargement of the tension of the adjacent tendon under the severe environment has been discussed thoroughly. The detailed effect of the failure of the tendon can be seen in the discussion, which would be interested in the engineering application for the tension leg floating wind turbine.