To further evaluate the thermal stability of bis (nitroguanidine) methane (BNGM) and explore its potential application as energetic material, the thermal behavior, specific heat capacity, adiabatic time-to-explosion and impact sensitivity of BNGM were studied by differential scanning calorimetry (DSC), micro-DSC, thermogravimetry /differential thermogravimetry (TG/DTG) and impact experiment. Results show that the thermal behavior of BNGM can be divided into two exothermic decomposition processes. The peak temperatures of the two decomposition processes at a heating rate of 10 ℃·min^-1 are 208.1 ℃ and 292.5 ℃, respectively. Its self-accelerating decomposition temperature (T_SADT) and critical temperature of thermal explosion (T_b) are 189.6 ℃ and 190.9 ℃, respectively. Its molar heat capacity at 298.15 K is 251.9 J·mol^-1·K^-1. Adiabatic time-to-explosion is estimated to be about 280 s. BNGM has a low impact sensitivity, which is higher than 23.5 J. The thermal stability of BNGM is good.