Composite solid propellants (CSP) are extensively used in both military and space applications due to their simplistic design. In composite propellants, many ingredients are used like oxidiser, fuel, binder, burn rate modifiers, curing agent, and plasticisers. In the case of missiles, they are casted and stored for a long duration before they are used. They undergo a slow decomposition process due to presence of highly active ingredients in close proximity to each other. Factors’s like temperature, humidity, selfweight of the propellant act as a natural stimulant for these degradation processes, which are mostly cyclic in nature. This leads to deterioration in the mechanical and ballistic properties of the CSP. So an approximate estimation of these degradation is needed to calculate the safe operating life of the missile. Conventionally, isothermal accelerated ageing studies are carried out to estimate these changes. The present work gives an insight into the literature review about the accelerated ageing studies on ballistic properties of the propellant. In the isothermal accelerated ageing technique, this deterioration in properties is studied by subjecting the specimen to accelerated ageing at higher isothermal ageing conditions. But this technique cannot capture the effects of diurnal and seasonal variation in temperatures. The cyclic accelerated ageing technique developed by Nasser is a more practical technique to approximate the degradation in properties. Accelerated ageing studies are carried out on Aluminised- HTPB-AP based CSP with 0.4% CC burn rate, and tests like burn rate measurement and heat of combustion are carried out to find the effect of ageing on ballistic properties of CSP. The heat of combustion value shows no deterioration on ageing, but decrease in burn rate is observed in isothermal and cyclic accelerated ageing schemes. Oxidation of burn rate modifier is hypothesized as the reason for the decrease in burn rate of the propellant. So a systematic study is adopted to find the effect of ageing on the AP pellets with a lower concentration of CC. An dedicated accelerated cyclic ageing scheme for the ageing of AP-CC is designed. Ageing of AP-CC pellets is in progress. The future scope of this work will be to study burn rate characterization of propellant with both un-aged and aged propellant. The effect of ageing on other burn rate modifiers like Iron oxide (IO) and Activated charcoal (AC).