Abstract: Three fabricated integral RC beams with rectangle- and T-sections are fabricated. Their external shells are precast and the core concrete is cast-in-place. Their bending capacities are tested. The load-deflection relation, cracking load and ultimate capacity of the two types of RC beams are investigated. The results show the new-type fabricated assembly beams have the same flexural behavior as RC beam, namely, good integral and ductility. Besides, the cracking load and ultimate capacity are discussed. The results can be referred to for the design of this kind of fabricated integral RC beams.