4-Amino-1,2,4-triazole copper complex (4-ATzCu) was synthesized, and its thermal behaviors, nonisothermal decomposition reaction kinetics were studied by DSC and TG-DTG techniques. The thermal decomposition reaction kinetic equation was obtained as: $dalpha$ / dt =$10^{22.01}$ (1-$alpha$)[-ln(1-$alpha$)]$^{1/3}$ exp($-2.75 imes10^4$ /T). The standard mole specific heat capacity of the complex was determined and the standard molar heat capacity is 305.66 $J{cdot}mol^{-1}{cdot}K^{-1}$ at 298.15 K. The entropy of activation $({Delta}S^{ eq})$, enthalpy of activation $({Delta}H^{ eq})$, and Gibbs free energy of activation $({Delta}G^{ eq})$ are calculated as 171.88 $J{cdot}mol^{-1}{cdot}K^{-1}$ 225.81 $kJ{cdot}mol^{-1}$ and 141.18 $kJ{cdot}mol^{-1}$, and the adiabatic time-to-explosion of the complex was obtained as 389.20 s.