The invention is a reinforced concrete solid bearing structural floor system, comprising cast-in-site reinforced concrete top slab, cast-in-site reinforced concrete ribs, and cavity forms, where the cavity forms are arranged at intervals, the cast-in-site reinforced concrete ribs are between the cavity forms, and the top slab is on the cavity forms, and they are poured into an organic whole, and the cavity form comprises upper crest slab, ambient side wall and bottom, which are interlinked to compose a closed polyhedral cavity, and there is at least a member in the cavity. And it is characterized by that the member is a curved rod, dog-legged rod, cable, uniform-section straight rod, varying-section solid straight rod, up-opened hollow rod or their combination, or combination of varying-section hollow straight rod and the above members, and the cavity forms are provided with hanging pieces and/or handle and the bottom is raised outward out of bottom side. And it is applied to roof system, sole plates, concrete wall bodies, bridges and other hollow concrete structures. |