This paper is to study experimentally the ultimate strength of reinforced perforated composite beams. One perforated steel beam, one normal composite beam, two perforated composite beams and two composite beams with reinforced web openings accoding to the opening to the opening shape ratio. Moment-shear ratio was 330. Opening depth was 70% of steel beam depth. As the result, we could find out the following conclusions: 1. The concerte slab in composite beam can increase up so much the strength of the beams. 2. By using reinforcement in the vicinity of openings, the ultimate strength of composite beams with web opening can incerese up to that of composite beams without web openings. 3. The ultimate strength of perforated composite beams accoding to the moment-shear ratio was little concerned with opening length.