According to the composition and structure properties of the NEPE propellants,the finite element calculation model of the NEPE solid propellants was established by the ANSYS 10.0 finite element calculation software. The damage trend and variation regularity of the NEPE propellants under unilateral tensile was simulated. Effects of the solid particle content,bonding agent content,composition and particle diameter of the oxidant on the damage trend of NEPE propellants were discussed by comparing the stress concentration factor α and the debond angle θ. The results show that the mechanical performance simulated by the established finite element model of the NEPE solid propellants is in good agreement with the experimental regularity.