To capture the shear resisting mechanism of reinforced concrete beams, such as the occurrence of diagonal cracking, the yielding of shear reinforcement, and the crush of web concrete and also construct a practical macroscopic shear resisting model, the lattice model, that can be considered as a simplified analytical model, has been newly developed. The applicability of the lattice model is examined by proposed equations and existing experimental data. After the verification for the lattice model, the validity and problems of the modified truss analogy are examined using the lattice model.