The leg structure is an important part of the net cage, which is directly related to the safety and stability of the cage system. The truss framed leg can reduce the wave load on the leg, and has certain advantages in the application of Jack-up Offshore net cage. In this paper, based on ANSYS finite element software, the numerical simulation of X type, double K type and K type truss framed leg configurations is carried out. In order to achieve optimal strength, the stress and displacement of three types were studied under storm survival conditions. The results indicate that: the stress in all three truss framed legs is below the allowable limit, meeting safety requirements; the highest stress occurs at the joint between the leg and boot, and the maximum displacement is observed at the free end of all three types of legs; the maximum stress and displacement of X-type leg are the least among the three types, and the stress of X-type varies little along the leg. The results of this study can provide reference for the selection and design of legs of jack-up Offshore net cage.