Combustion behavior of inorganic nitrates (KNO3, NaNO3, CsNO3, Ba(NO3)(2), Sr(NO3)(2), Pb(NO3)(2,)and NH4NO3) based energetic materials in wide range of pressure (0.1-18 MPa) was studied. Samples have the same binder and differ in combustion temperature due to a change of oxidizer excess ratio (alpha). It is shown that compositions differ in the burning rate, in its dependence on pressure. The extreme dependence of burning rate on alpha is established. The combustion temperature of the samples was experimentally determined.