The landing precision of an Unmanned Aerial Vehicles (UAVs) is influenced seriously by the complexity of the environment.In this article,we focus on the accuracy landing of UAV,and analyze the main factors that bring in errors.Some methods were given for improving the performance and environmental adaptability of UAVs in landing process.Simulation was made with Monte Carlo method to examine the suitability of these control methods under different sort of uncertainties.The results show that the improved control method can reduce the deviation of landing points,and increase the landing precision.