Abstract: This study investigates a novel 15 MW tension-leg platform floating offshore wind turbine (TLP FOWT) deployed in the deep-water region of the South China Sea, where extreme meteorological events such as Typhoon ‘Yagi’ pose considerable operational challenges. A fully coupled numerical model is developed and validated against a 1:64 scale physical model experimental results. Response analysis under multidirectional excitation reveals critical insights into platform hydrodynamics, tendon dynamics, and structural load characteristics. Statistical assessments incorporating historical meteorological and metocean data and parametric studies show that wave incidence angles that bisect adjacent tendon quadrants reduce the mean platform offset by up to 18.22% compared with other incidence angles. Spectral coherence analysis indicates that, at ω=0.217 Hz, the spectral energy is not attributable to coupling between surge and pitch. Notably, the amplitude of tower base bending moment exhibits decreasing directional correlation as load magnitude increases. These findings provide theoretical foundations for enhancing TLP FOWT survivability in typhoon regions and inform optimal positioning strategies for offshore floating wind turbine systems.