In order to simulate the landing process of a UAV landing gear more realistically,the landing gear was designed reasonably.Taking the semi-axle main landing gear and semi-swing arm rear landing gear of the UAV as research targets,a mechanical analysis model of the main landing gear was established,which included damping and cushioning strut friction that simulated the change in load caused by the equivalent aerodynamic lift of the UAV;the landing gear dynamics analysis model considering the bending moment deformation of the pillar and the wheel was established.A digital prototype was built for joint simulation and the landing dynamic characteristics were studied.The results show that the model has high accuracy,and the developed landing gear device has good buffer performance.It meets the design requirements and has certain engineering application value.