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The thermal behavior and non-isothermal decomposition kinetics of 1-amino-1-hydrazino-2,2-dinitroethylene potassium salt[K(AHDNE)] were studied under the non-isothermal conditions by different scanning calorimeter(DSC) method.The thermal behavior of K(AHDNE) presents three exothermic decomposition processes.The kinetic equation of the first thermal decomposition reaction obtained is da/dT=(101963/β)3(1-α)[-ln(1-α)]2/3exp(-1.862× 105/RT).The self-accelerating decomposition temperature(TSADT) and critical temperature of thermal explosion(Tb) of K(AHDNE) are 162.5 and 171.4 ℃,respectively.K(AHDNE) has higher thermal stability than AHDNE.