It becomes a serious problem how to comprehensively reuse the exservice double base propellants(DBP).A new kind of plastic surrogate can be made by mixing the pretreated exservice DBP with low density polyethylene(LDPE),adding flame retardants and smog inhibitors. The oxygen index of this surrogate is over 30. Tensile strength higher than 32MPa; gradient resistance R_g≥0.8×10¹⁵Ω; surface resistance R_s≥1.3×10¹⁵Ω; bending behavior with no deformation at 80℃ and no crack at -50℃. This new method not only saves raw materials for plastic industry,but aslo reduces the environmental pollution,compared with the traditional disposal method by burning or burying the exservice DBP.