[en] The approach based on the chemical picture of plasma taking into account effects of Coulomb interaction, short range repulsion of atoms and molecules, free electron degeneracy for description of equilibrium composition and thermodynamic functions of non-ideal plasma is proposed. The results of calculations of thermodynamic parameters using the models based upon this approach are presented. The parameters of thermal and caloric equation of state for hydrogen plasma were calculated from moderate to high densities in wide range of temperatures. (copyright 2016 WILEY-VCH Verlag GmbH and Co. KGaA, Weinheim)