[en] Energy dependence of differential cross section of elastic proton-proton scattering is discussed in the framework of the model, based on using s-channel unitary condition. To obtain energy dependence the model parametrization was accomplished with account of crossing symmetry, based on two main principles: invariance under CPT-transformations and analytical properties of scattering amplitude. It is shown that the model enables to describe the dependence on momentum transfer and the energy of differential cross section of elastic proton-proton scattering in a wide range of energies and momentum transfers