In order to meet the requirements of rapid and high precision automatic leveling of UAVs in complex environment,the leveling control methods and strategies of UAVs were explored.According to the leveling hydraulic principle of UAVs,the leveling system was modeled and simulated in AMESim software to simulate the leveling operation of the hydraulic leveling system on the platform.The simulated system leg displacement curve,leg hydraulic cylinder flow curve,reversing valve flow curve,clearly revealed the system dynamic loop characteristics.The simulation results show that the system simulation model can adapt to the complex working conditions,and the rationality of the leveling system is verified,which provides reference for the design and analysis of similar hydraulic leveling system.