Abstract: The synthesis of a novel explosive-N,N′-bis（3,5-dichloro-2,4,6-trinitrophenyl）-3,4-diaminofurazan（BCNDAF） is described in detail.The condensation of dichloroglyoxime（Ⅰ） with 3,5-chloroaniline in basic media gives N,N′-bis（3,5-dichlorophenyl）diaminoglyxime（Ⅱ） with a yield of 66%.（Ⅱ） can then be converted to N,N′-bis（3,5-dichlorophenyl）-3,4-diaminofurazan（Ⅲ） with a yield of 64% via dehydration in a NaOH/HOCH₂CH₂OH solution at high temperature.The title compound（Ⅳ） is obtained in 82.7% yield by the nitration of（Ⅲ） with nitric acid（w（HNO₃）=85%）at 70?℃ for 3?h.The melting point of（Ⅳ）is 124～125?℃.The structures of N,N′-bis（3,5-dichloro-2,4,6-trinitrophenyl）-3,4-diaminofurazan and its two intermediates have been determined by IR,（）¹HNMR,MS and elemental analysis.