The special-shaped lightweight SI (skeleton and infill) floor structure studied in this paper is a kind of space reserved in the structure of the structure, and there is no need to erect a cavity in the later decoration process to realize the structure and the A new type of fabricated floor with separation of pipelines. In order to study the force mechanism and influencing factors of this new structure, this paper uses Midas FEA finite element software to analyze the deformation and stress of the structural element, and studies the influence of the number of slots and the size of the slots on the static performance of the structure. The analysis results show that the new floor slab performs well in static performance and can achieve a larger space span; under the premise of ensuring the same capacity, increasing the number of wire ducts and reducing the size of the wire ducts can effectively solve the stress concentration in the middle of the floor slab. Phenomenon, and improve the rigidity of the structure. The result of the parametric analysis is: the best structural layout is based on the transverse central axis, with 2 wire slots reserved on the upper board, 3 wire slots reserved on the lower board, and the specification of the wire slot is 70mm×50mm×20mm.