3-Amino-4-chloroximidofurazan (ACOF) is an important precursor of synthesizing new furazanon (furoxano) energetic compounds.Its thermal behavior was studied by the differential scanning calorimetry (DSC) method.The results of this study show that there are three exothermic decomposition processes.Its kinetic parameters of the intense exothermic decomposition process were obtained from the analysis of the DSC curves.The apparent activation energy,pre-exponential factor and the mechanism function are 153.54 kJmol?1,1014.34 s?1 and f(α) = 2(1-α)[–ln(1-α)]1/2,respectively.The specific heat capacity of ACOF was determined with a continuous Cp mode of micro–calorimeter.Using the relationship between Cp and T with the thermal decomposition parameters,the time of the thermal decomposition from initialization to thermal explosion (adiabatic time-to-explosion,tTIAD),the self-accelerating decomposition temperature (TSADT),thermal ignition temperature (TTIT),critical temperatures of thermal explosion (Tb) and period of validity (t0.9)were obtained to evaluate its thermal safety.