A novel energetic plasticizer containing —N—NO₂, —N₃ and —ONO₂ groups in molecular structure, pentanol-3-nitraza-5-azidonitrate(PNAN)(crude product) was designed and synthesized for the first time via reaction in dimethyl sulfoxide, using 1, 5-dinitrato-3-nitraza pentane(DINA) and sodium azide as raw materials The crude product was separated and purified bysilica gel column chromatography with the purity of 98.60%.The structure of PNAN was characterized by IR, ¹HNMR and elemental analyses.Some physicochemical properties of PNAN were obtained by the tests.Results show that the density is 1.46 g·cm^-3, decomposition temperature 172 ℃, glass transition temperature -41℃, viscosity 19.5 mPa·s, friction sensitivity 12% and impact sensitivity 56%.