Abstract: A wind turbine generator model of the "blade-turbine-foundation-ground" coupling system was established to study the aerodynamic effect and damage mechanism of the structure under fluid-solid coupling.The CFD/CSM bidirectional fluid-solid coupling method was used to realize the interaction between wind field airflow and blade structure coupling with the tower structure and foundation of the unit.The blade aerodynamic effects, structural damage development law and failure mode under different wind speeds were researched.The results show that the air can effectively drive the fan blades.Under the action of fluid-solid coupling, the aerodynamic effect and negative pressure area of the blades expand with the wind speed.Aeroelastic instability occurs at the tip under extreme wind speed, but the structural damping tends to be stable.The concrete foundation ring on the windward side of the fan is first damaged, and gradually extends along the edge of the steel ring to both sides to form a penetrating belt.