The adiabatic stability of expanded AN-diesel oil explosives and expanded AN-trinitrotoluene-diesel oil explosives were tested by Accelerating Rate Calorimeter (ARC). According to the ARC data, a conclusion was drawn that after adding TNT to the expanded AN-diesel oil explosive, its stability decreased and the induction time reduced greatly, while the exothermic heat increased greatly, and the blasting energy and power also increased sharply. Finally, the activation energy E and frequency factor A were calculated by the velocity constant method.