Nine kinds of 7H-difurazano[3, 4-b:3′, 4′-f]furoxano[3″, 4″-d]azepine(a-i) were synthesized with 3, 4-bis(3-nitrofurazan-4-yl)furoxan(BNFF) as starting materials, and the SN2 mechanism of cyclization was discussed.The structure of these compounds were characterized by ¹H NMR, ¹³C NMR, IR and MS.Then 7-(2-amino-1-methyl)-difurazano[3, 4-b:3′, 4′-f]furoxano[3″, 4″-d]azepine(c) was used to synthesize two new compounds, N-(2′, 4′-dinitrophenyl)-and N-(3′-amino-2′, 4′, 6′-trinitrophenyl)-7-(2-amino-1-methyl) -difurazano[3, 4-b:3′, 4′-f]furoxano[3″, 4″-d]azepine(j, k), by reacting with 2, 4-dinitrochlorobenzene, 3-amino-2, 4, 6-trinitrochloro-benzene.The thermal properties j and k were analyzed by differential scanning calorimetry.Results show that the first and second exothermic peak of compound j are at 258.03 ℃ and 329.92 ℃, and for compound k, they are at 275.35 ℃ and 360.24 ℃, indicating that the introduction of nitrobenzene can increase the thermal stability.The detonation performances were estimated as follows:density, detonation velocity and detonation pressure of j and k are 1.68 g·cm^-3, 6945 m·s^-1, 21 GPa; 1.74 g·cm^-3, 6438 m·s^-1, 18 GPa, respectively.