2-(2′, 4′, 6′-trinitro)phenylamino-4-nitroimidazole was obtained by condensation of 2-amino-4-nitroimidazole with 2, 4, 6-trinitrochlorobenzene in yield of 30.9%. Its structure was characterized by ¹H NMR, MS and IR. And differential scanning calorimetry (DSC) was used to study the thermal behavior of 2-(2′, 4′, 6′-trinitro)phenylamino-4-nitroimidazole. The decomposition temperature was 285.92 ℃.