Abstract <p>Numerical modeling of the thermodynamic parameters of platinum shock wave loading in this work is performed in terms of a thermodynamically equilibrium model, which makes it possible to describe experimental data over a wide range of pressure and porosity values for both pure substances and heterogeneous materials. The possibility of calculating the behavior of the mixture according to the model makes it possible to reliably simulate the parameters of the studied samples with components that undergo a phase transition under shock wave loading. In this paper, thermodynamically consistent small-parameter equations of state for Pt of two phases are constructed. The parameters of the equations are determined, which make it possible to reliably describe the values of heat capacity, entropy, and thermodynamic Gibbs potential. Shock adiabats in the range to 2 TPa are constructed. With a small number of parameters determined according to experimental data the reliable description of the shock wave loading of Pt has been obtained. The results of numerical modeling correspond well to the data obtained on the basis of experiments and do not contradict the calculations of other authors.</p>