To study the synthetic mechanism and properties of 3，7-dinitro-［1，2，4］triazolo［5，1-c］［1，2，4］triazine-4-amine （TTX），the synthetic mechanism of TTX was studied by density functional theory （DFT）， and the influence of pH value on the cyclization reaction was investigated. Thermal properties and impact sensitivity were studied by differential scanning calorimetry （DSC） and BAM drophammer apparatus， respectively. TTX was synthesized by the coupling reaction of sodium cyanonitromethanide and azo salt of 5-amino-3-nitro-1，2，4-triazole （ANTA）， following by intramolecular cyclization reaction. TTX showed a decomposition temperature of 281.8 ℃ and a apparent activation energy of 356.7 kJ·mol^-1. The impact sensitivity of TTX was measured to be 60 J. Moreover， the compatibility of TTX with HMX， RDX， Al powder and NC was studied. TTX had a good compatibility with Al powder， but a fair compatibility with HMX and a poor compatibility with RDX and NC. Therefore， adding RDX or NC into TTK would apparently increase its sensitity.