On the basis of the idea that hadrons consist of more fundamental particles whose trans verse momenta are sharply cut off at k1. in the hadron, three physical regions are classified. In particular a new condition is added to the Drell-Levy-Yan conditions for the validity of the parton model. Based on the above analysis, explicit forms of the electromagnetic form factors of all mesons and baryons are given and moreover it is shown that 11W 2n=11W 2P in the region where the parton model holds, at least in regard to the data available at present. Deep inelastic lepton-hadron scattering is interesting in many respects. This will not be only a topic, but an important phenomenon which we must investigate in order to expose the substructure of hadrons. The history of the establishment of quantum mechanics suggests us how to study an unknown law of motion of a new stratum in nature. It is an undoubtful fact that the determination of the structure of the atom was one of the key-points in the establishment of quantum mechanics. One of the experiments which played essential roles in the determination of the atomic structure was Thomson's one. He verified experimentally that, in the case of the scattering of the high energy X ray (hv';;Pthe ionization energy) from electrons in the atom, one can consider the scattering as the incoherent one in the free state, and determined the number of electrons in the atom by comparing the experimental cross section with the formula of Thomson scattering. We may consider that the lepton-hadron scattering in the high-energy and high momentum-transfer region takes place through a mechanism similar to the high energy X ray-atom scattering. Then we may simply determine what are the constituents of hadrons by investigating the phenomenon in that region. The above cosideration suggests the fruitfulness of the parton model.1> Based on the parton model, we can explain the so-called scaling behavior in deep inelastic lepton hadron scattering and the behavior of electromagnetic form factors of hadrons in large momentum transfer regions. In the parton model we can consider that the elastic and inelastic form factors of hadrons represent directly the structures of hadrons. Previously we examined, in the short note,2> the kinematic region where the parton model holds. In this paper we shall study the same problem slightly in