For fully understanding the thermal properties of Cu-FOX-7 complexes [FOX-7=1,1-diamino-2,2-dinitroethylene], thermal decomposition behavior of Cu(NH₃)₂(FOX-7)₂ was studied with DSC and TG-DTG methods. The kinetic equation of the first exothermic decomposition process is $\frac{{{\rm{d}}\alpha }}{{{\rm{d}}T}} = \frac{{{{10}^{15.12}}}}{\beta }4{\alpha ^{3/4}}\exp ( - 1.429 \times {10^5}/{RT})$. The self-accelerating decomposition temperature and critical temperature of thermal explosion are 145.5, 156.2 ℃, respectively. The thermal stability of Cu(NH₃)₂(FOX-7)₂ is much lower than that of FOX-7. The specific heat capacity of Cu(NH₃)₂(FOX-7)₂ was determined with a micro-DSC method. Molar heat capacity is 447.3 J·mol^-1·K^-1 at 25 ℃. Adiabatic time-to-explosion was also estimated to be about 9.5 s. The thermal stability of Cu(NH₃)₂(FOX-7)₂ is much lower than that of (FOX-7).