Introduction  Due to the limitation of ecological protection and wind field boundary, there are obvious hill obstacles in the prevailing wind direction of some turbine sites, which affects the generating capacity and safety performance.This paper aims to study the methods to reduce the impact of the hilltops to the wind turbine.

  Method  The numerical simulation method was applied for the the terrain with hilltop in the prevailing wind direction around the turbine site based on STAR-CCM+ software, analyzing the influence of sector management, elevating hub height and terrain optimization on the safety performance of the wind turbine.

  Result  It's shown that sector management, elevating hub height and terrain optimization can improve the safety of the wind turbine. However, the method of double platform terrain optimization is more effective to improve the safety of the wind turbine for the project.

  Conclusion  The results can provide reference for how to reduce the impact of upwind hilltop on the wind turbine.