A new energetic Zn-FOX-7 complex [Zn(en)₃](FOX-7)₂ was firstly synthesized and characterized by X-ray diffraction (FOX-7, 1, 1-diamino-2, 2-dinitroethylene). The crystal is monoclinic, space group C2/c with crystal parameters of a=0.77170(16) nm, b=1.6720(3) nm, c=1.6996(3) nm, β=94.333(3)°, V=2.1867(7) nm³, Z=4, μ＝1.194 mm^-1, F(000)=1112, D_c=1.628 g·cm^-3, R₁=0.0359, wR₂=0.0955. Thermal decomposition of [Zn(en)₃](FOX-7)₂ was studied by differential scanning calorimetry and thermogravimetry methods. Results show that central Zn²⁺ ion is coordinated by six N atoms from three ethylenediamine molecules, which form a distorted octahedral structure, and while FOX-7^- anion has no coordination with central Zn²⁺ ion. The self-accelerating decomposition temperature and critical temperature of thermal explosion of [Zn(en)₃](FOX-7)₂ are 167.1 ℃ and 168.8 ℃, respectively. [Zn(en)₃](FOX-7)₂ exhibits lower thermal stability than Zn(NH₃)₂(FOX-7)₂. The impact sensitivity of [Zn(en)₃](FOX-7)₂ is about 20.6 J.