Abstract: A research has been completed by appling PEM model to combustion simulation of aluminized propellants.The effects of aluminium particles on the surface energy of the propellant are taken into consideration so simply as the heat sink PEM model of J.P.Renie et al,but a new method to determine the pseudopropellant's formulations is presented in this paper,thereby an extended and modified PEM model is developed.According to this model,the burning rates and pressure exponents of aluminized propellants are calculated.The results show that our model makes the calculated results of burning rates and pressure exponents more approach to their experimental data as compared with the heat sink PEM model of J.P.Renie et al.