Recently, there have been various studies how to incinerate explosive waste safely due to environmental problems and safety problems. Explosive waste requires a new incineration mechanism, because of the pollution gas generated during the conventional treatment process, such as rotary kiln or outdoor exploration. This study focuses on the fluidized bed incinerator technology which can burn the target material using only a small amount of air at a relatively low temperature condition. In this study, we simulated the process of burning Double Based Propellant (DBP) mixed with water in the incinerator safely. The fluidized bed incinerator was modeled as a cylinder with a diameter of 0.5 m and a height of 2.0 m, and a case study was carried out by changing the mixing ratio of the injected slurry. As a result, we confirmed the optimal mixing ratio with water for burning DBP without explosion, and confirmed that DBP combustion and decomposition reaction occurring inside the incinerator can be safely simulated. Based on this, it is considered that the design of the actual incinerator will provide a new direction for research on the explosive waste treatment process in Korea in the future.