The equation of state (EOS) for TATB‐based explosives has been built using complex information — the experimental data (Hugoniots of PBX9502 for different initial temperatures) as well as the results ofab initioand molecular dynamic calculations of the thermodynamic parameters (heat capacity at constant volume and isochoric pressure coefficient). The main features of these thermodynamic coefficients were identified, namely the strong temperature dependence of heat capacity and the strong volume dependence of isochoric pressure coefficient. Shock wave heating calculations for explosive with different initial temperatures and densities were performed. The analysis of calculated dependences T(P) was done. © 2004 American Institute of Physics