Abstract: As the main supporting device of the feed cabin, the star frame is the foundation of the whole feed cabin. Starting from the design requirements of FAST feeder cabin, this paper combines the main role of star frame in the feeder cabin. This paper presents the detailed structural design of the star frame of FAST feed cabin. On the basis of structural design, the parametric modeling of finite element model of star frame is realized by using finite element software Ansys Workbench and APDL language. The finite element analysis is carried out for different postures of star frame in the whole workspace, and the stiffness, deformation and stress results of star frame in different postures are obtained. The results show that the structural design of star frame meets the performance and safety requirements, and lays a foundation for the implementation of the feed cabin project.