The basic laws and features of combustion of pyrotechnic gas generating compositions were studied. The components and their ratios for preparation gas generating compositions on the base of ammonium nitrate (an oxidizer) and coal arenes (the fuel-binder) and melamine and polyvinyl alcohol (the gasification supplements) were found. The thermodynamics calculations of the characteristics (adiabatic temperature of burning and equilibrium composition of products) of pyrotechnic compositions with the use of complex of the programs "Thermo" based on the method of minimization of thermodynamics potential of energy of Gibbs were carried out. Two formulations were created and investigated. It was shown that the compressive strength of compositions of pyrotechnic products was provided by cementators (coal arenes). [ABSTRACT FROM AUTHOR]