The structure and properties of 5-aminotetrazolium nitroformate were studied using quantum chemistry method. The density, heat of formation, detonation velocity and pressure were calculated. The calculated density was 1.93 g·cm^-3, and the detonation velocity and pressure were 9.47 km·s^-1 and 38.82 GPa, respectively. The detonation properties were better than those of TNT, RDX, HMX.