Recrystallization of 1, 3, 5-triamino-2, 4, 6-trinitrobenzene(TATB) in five kinds of ionic liquids, including 3-ethyl-1-methylimidazolium tetrafluoroborate, 3-butyl-1-methylimidazolium tetrafluoroborate, 3-butyl-1-methylimidazolium hexafluorophosphorus, 3-hexyl-1-methylimidazolium bromine and 3-butyl-1-methylimidazolium chloride(［Bmim］Cl) was investigated. TATB can be dissolved in ［Bmim］Cl, and the thermal stability of TATB improved after recrystalization in the ionic liquid was also investigated. The exothermic temperature of the recrystalized TATB (375 ℃) which is higher than that of raw TATB (363 ℃) indicats that the stability of recrystalized TATB is improved.