1,1-Diamino-2,2-dinitroethylene (FOX-7) was investigated in oxidation reactions. 1-Chloro-1,1-dinitro-2- (N-chloro-amidino)-ethane was obtained in a mixture of potassium permanganate and concentrated hydrochloric acid with the yield of 70%. The reactivity of electrophilic substitution reaction of FOX-7 was confirmed，and the reaction mechanism was investigated. The structure was identified by NMR,IR,MS and elemental analysis. The single crystal of 1-chloro-1,1-dinitro-2-(N-chloro- amidino)-ethane was cultivated from dichloromethane. The crystal structure was determined by a X-ray single crystal diffractometer. Results show that the empirical formula is C₂H₂Cl₂N₄O₄ and the formula weigh is 216.98,the crystal is orthorhombic system,space group Pbcn with crystal parameters of a=0.9940(17) nm，b=1.0628(19) nm，c=1.4487(3) nm，V=1.5304(5) nm³，Z=8，D_c=1.883 g·cm^-3，F(000)=864 ，R₁=0.0325，ωR₂=0.0784. The compound′s melting point is 90 ℃,decomposition temperature is 136.6 ℃,so,the thermal stability is short of FOX-7.