Wind turbines are designed according to wind extremes of 50-year & 1-year recurrence interval calculated with observed historical wind data. However, changes in the wind extremes can impact safety of wind turbines notably once the climate pattern changes in its life cycle. Consequently, we collected wind data from 1973 to 2012 in 5 sites with prosperous wind power development. Generalized Pareto distribution was utilized to calculate wind extremes of 50-year & 1-year recurrence interval with wind data from 1973 to 1992 and 1993 to 2012. Moreover, the temporal and spatial variation of wind extremes and its impact on safety of wind turbines were analyzed. It is found that declining in wind extremes over long term scale in investigated sites in Inner Mongolia and Shandong positively affect the safety of wind turbines, while the sites in Central China slightly affect the safety of wind turbines.