4-Amino-5-nitro-1,2,3-triazole (ANTZ) and its derivatives, such as 2-(4-amino-5-nitro-1,2,3-trazole-1-yl)-1,3,5-trinitrobenzene (T-ANTZ) and 4-amino-5-nitro-1,2,3-triazole (M-ANTZ), were synthesized and characterized, whose structures were confirmed by IR, NMR and elemental analysis. The thermal behaviors of ANTZ, T-ANTZ and M-ANTZ were studied by the methods of DSC and TG-DTG, and the results showed that there is an obvious melting, process of ANTZ with melting point of 278.38 degrees C, while there is no melting process in the thermal behavior of T-ANTZ and M-ANTZ (the derivatives of ATNZ).