Abstract: As the core active support equipment of the new power system, Grid-Forming SVG integrates heavy components such as high-capacity capacitors and power modules in its power unit. The bearing performance of the base directly affects the safe and stable operation of the equipment. The traditional flat plate and single-beam bases have problems such as insufficient stiffness, large deformation and stress concentration. In order to optimize the mechanical properties of the base, three base structures, namely no beam (flat plate), single beam and double beams, are designed with 1023 carbon steel plate as the base material. The static simulation is carried out by using SolidWorks finite element method. Under the actual bearing condition, the stress, strain and displacement distribution of the three structures are compared. On this basis, the ultimate maximum bearing weight of the three structures is obtained through simulation. The results show that the double-beam structure can significantly reduce the peak stress, strain level and displacement deformation under working load, and the load transfer is more uniform. At the same time, the ultimate bearing weight is significantly higher than that of the flat plate and single-beam structures, and the comprehensive bearing capacity is the best. The research can provide a reference for the structural design and engineering application of Grid-Forming SVG base.