3,3-Dinitroazetidinium nitrate (DNAZ center dot HNO3) was synthesized, its thermal behaviour was studied under a non-isothermal condition by DSC and TG/DTG methods. The apparent activation energy (E-a) and preexponential factor (A) for the intense exothermic decomposition process were (112.52 +/- 1.37) kJ . mol (1) and (10(11.91 +/- 0.06))s (1), respectively. The specific molar heat capacity (C-p,C-m) of DNAZ center dot HNO3 was determined by a continuous Cp mode of micro-calorimeter, and the C-p,C-m is 248.32 J . K (1) . mol (1) at T = 298.15 K. The self-accelerating decomposition temperature (T-SADT), thermal ignition temperature (T-TIT) and critical temperature of thermal explosion (T-b) were obtained to evaluate its thermal stability and safety. Its Cp, m, thermal stability and safety were compared with 3,3-dinitroazetidinium perchlorate (DNAZ center dot HClO4) and 3,3-dinitroazetidinium chloride (DNAZ center dot HCl). (C) 2016 Elsevier Ltd.