In september 2003, the fan blades of wind turbine were damaged by typhoon "cuckoo"  in Shanwei Red Bay wind farm, an offshore hilly land. It can be concluded from the failure modes that the blades flutter have occurred and significantly reversed, which was related to the negative terrain. From this instance of the term, under the same intensity of typhoons, the risk of blade damage of sea wind turbine may be lower than that of coastal ones because of flat sea lack of local change conditions of wind direction. The storm also showed that it was the key for blade loss prevention to keep the wind turbine be paused state of stopping rotation, feathering and yawing.