Active additives for changing combustion properties are added into double-based propellants so as to meet multi-purpose demands. Potassium nitrate is an useful component for some special propellants and fire-extinguishers in Russia. But the study of combustion of double-based propellants containing KNO₃ shows that combustion catalysis is decreased, and the higher the KNO₃ content , the weaker the catalysis. Nitramines (RDX,HMX) show active function upon the energy properties and the combustion catalysis of propellants. The experimental results demonstrate that combustion rate of propellants with or without RDX is almost same. It means that Z for propellants with RDX is increased .For propellants containing HMX the catalysis show the same picture compared with that of containing RDX. Special study of catalysis of propellants upon nitramines shows that catalysts do not act upon nitramines. It means that only for double-based propellants nitramines demonstrate active role on combustion catalysis.The various function of active additives upon the combustion catalysis of propellants may be explained by the various mechanisms of combustion catalysis of propellants with KNO₃ and nitramines. Theoretically, in the space zone near the surface of condensed phase of double-based propellants there exists carbon frog-carbon aerosol zone, which can retain the catalysts particles and promote the catalysis reaction. KNO₃ as a positive oxygen balance compound can destroy the carbon aerosol zone, decrease the catalysis, nitramines as negative oxygen balance compounds can increase carbon aerosol zone inversely. Therefore basing on the various value of oxygen balance of additives the role of additives changes from promoting combustion catalysis to preventing them.