To evaluate the thermal safety of 2,2,2-trinitroethyl-N-nitromethyl amine(TNMA),basic data,including specific heat capacity(C_p) and thermal conductivity(λ),were estimated using empirical formulae.The standard enthalpy of formation of TNMA,△_fH_m~(θ)(TNMA,s,298.15 K),was calculated by an additive method of contributing bond energy to heat of formation Q_f,and the standard combustion enthalpy △H_m~(θ)(TNMA,s,298.15 K) and standard combustion energy △U_m~(θ)(TNMA,s,298.15 K) were calculated by thermodynamic formulae.The detonation velocity,detonation pressure,and heat of detonation were estimated using the Kamlet-Jacobs equation.The heat of decomposition reaction(Q_d) of TNMA was estimated by an empirical formula,and the thermal behavior of TNMA was studied by differential scanningcalorimetry(DSC).The kinetic parameters of the exothermic decomposition reaction of TNMA were obtained from analysis of DSC curves and standard volume of gas evolved(V_H) vs time(t) curves determined using a highly sensitive Bourdon glass membrane manometer.The parameters used to evaluate the thermal safety of TNMA,such as the self-accelerating decomposition temperature(T_(SADT)),critical temperature of thermal explosion(T_(be0) and T_(bp0)),adiabatic time-to-explosion(t_(Tiad)),50%drop height(H_(50))of impact sensitivity,critical temperature of hot-spot initiation(T_(cr)),thermal sensitivity probability density function S(T) for infinite plate-like,infinite cylindrical and spheroidal TNMA with half-thickness and radius of 1m at 300 K,peak temperature corresponding to the maximum value of the S(T) vs T curve(T_(S(T)max)),safety degree(SD),critical thermal explosion ambient temperature(T_(acr)),and thermal explosion probability(P_(TE)),were obtained from the abovementioned basic data.Results show that(1) TNMA has better thermal safety and heat-resistant ability than cyclotrimethylenetrinitramine(RDX),and that in TNMA,the transition from thermal decomposition to thermal explosion occurs readily;(2) the thermal safety of large amounts of TNMA of different shapes decreases in the order:sphereinfinite cylinderinfinite plate;(3) TNMA has high standard combustion energy and high chemical energy(heat) of detonation,with an explosion performance level approaching that of cyclotetramethylenetetranitramine(HMX).It is sensitive to shock,and has an impact sensitivity level approaching those of pentaerythritol tetranitrate(PETN) and tetryl,so TNMA can be used as a main ingredient in composite explosives.