Main aim of this paper is to apply a numerical analysis of reinforced concrete hollow beam using three-dimensional (3D) finite element model under monotonic loading, for this purpose, a well-known finite element traditional software ANSYS has been used. Many variables were studied in the model such as the ratio of hollow area to effective section and the ratio of shear reinforcements. As well as, this study focused on distribution of mesh, density and effects of mesh size on accuracy of finite element model results. Among the two method that representing the cracks, a discrete model has been used. eight-node brick element (SOLID 65) 3D element were used to represent the concrete, while using (LINK 180) 3D finite strain spar element for modeling the flexural and shear reinforcements. The base plates for each loading points and supporting has been ideally obtained by using (SOLID 185) 3D structural solid element. The verification of the finite element model and the materials mechanical properties has been chosen from literature. The advantages of the 3D finite elements model creates a full concept about the model in terms of deformation, stress different directions and critical areas. The importance of this paper will be directed for those who wish to study reinforced concrete hollow beam applications numerically as it provides an idea about how to choose the mesh density and the methods of modeling to achieve accuracy and numerical stability. The results of 3D finite element model shows that the general behavior of the finite element models clarify by the load-deflection curves at mid span and the yielding reinforcement occurrence an appropriate agreement with the compared experimental data from the literature. The maximum tolerance between the modeled sections and its corresponding experimented one were 6.8%.