A new seven-membered cyclic compound 7-hydroxytrifurazano［3，4-b：3′，4′-f：3″，4″-d］azepine （HYTF） was synthesized using bis（3-nitrofurazan-4-yl）furazan and hydroxylamine solution as starting materials. The structure of HYTF was characterized by IR， ¹³C and ¹⁵N NMR and elemental analysis. The chemical shifts of ¹³C and ¹⁵N NMR for HYTF were assigned based on the experimental results and theoretical simulation （Gauge Independent Atomic Orbital）. 7-Hydroxytrifurazano［3，4-b：3′，4′-f：3″，4″-d］azepine （HYTF） and 7H-trifurazano［3，4-b：3′，4′-f：3″，4″-d］azepine （HATF） could be synthesized by controlling the reaction temperature， and their formation mechanism were proposed and illuminated. Based on the experimental density （ρ=1.86 g·cm^-3） and calculated enthalpy of formation（Δ_fH（s）=573.8 kJ·mol^-1）， the detonation velocity （8181 m·s^-1） and detonation pressure （28.0 GPa） of HYTF were calculated by Explo5 （V6.04）. In addition， the thermal stability （T_dec=161.8 ℃） was analyzed by differential scanning calorimetry （DSC）.