Reinforced truss floor is a composite formwork welded by reinforced truss and galvanized profiled steel plate, which reduces the erection and dismantling of formwork and has the characteristics of economy, convenience, safety and reliability. In the construction of reinforced truss floor slab, the layout should be reasonable, the loss should be reduced as much as possible and the site cutting should be carried out. When the studs are welded on site, the root welding feet should be uniform and full. Angle steel is generally used to support reinforced truss floors at beam-column joints. However, for the circular steel frame column with larger diameter, it is suggested to adopt the outer ring plate of the steel column, which not only makes the stress on the end of the floor more reasonable, but also solves the problem of slurry leakage during the pouring of floor concrete and ensures the pouring quality of floor concrete.