Abstract:The selflocking hydraulic leg is taken as the research object. The finite element model (FEM) was established by ANSYS and the static analysis was carried out for the work of the selflocking leg. The distribution of the stressstrain of the leg in the selflocking condition was obtained. The result show: the radial deformation of the cylinders inner wall is consistent with the theoretical design value, which fully explains the correctness of the model. The normal stress and the contact stress distribution of the contact surface are quite complicated, but it is in accordance with the mechanical characteristics of the actual model, which provides the basis for further finite element analysis and embodies the superiority of FEM. At the same time, through the selflocking hydraulic leg performance testing, the selflocking ability of the leg meet the design requirements, the unlock pressure meet the needs of practical work, which provides reference for the further optimization of the structure and improvement.