1-Amino-3, 5-dinitro -1, 2, 4-triazole(ADNT) was synthesized by amination of the sodium salt of 3, 5-diamino-1, 2, 4-triazole (DNT-Na⁺) with mesitylene sulfonyl hydroxylamine (MSH) with yield of 66%, in which the DNT-Na⁺was obtained from 3, 5-diamino-1, 2, 4-triazole. The structure of ADNT was characterized by IR, MS, ¹H NMR, ¹³C NMR and elemental analysis, the thermal behavior was studied by differential scanning calorimetry(DSC). The factors effecting amination were investigated as well. Results show that the optimum reaction conditions are the molar ratio DNT-Na⁺ to MSH is 1:1.5, reaction time 12 h at room temperature. The melting and decomposition temperatures are 128.7, 225.8 ℃, respectively, and the impact sensitivity (H₅₀) with 2 kg drop weigh is beyond 112cm, which showing ADNT is an energetic insensitive explosive with good comprehensive performance.