Composite construction dominates the non-residential multi-storey building sector. This has been the case for over twenty years. Its success is due to the strength and stiffness that can be achieved, with minimum use of materials. The reason why composite construction is often so good can be expressed in one simple way - concrete is good in compression and steel is good in tension. By joining the two materials together structurally these strengths can be exploited to result in a highly efficient and light weight design. In this project, we have determined the flexural strength of composite beams. Various specimens with water cement ratio 0.45 where casted. The specimens were tested for 28 days strength. To evaluate the effectiveness of the composite beams. The results were tabulated and line chats and conclusions were given.