To understand the thermal decomposition kinetics and thermal safety property of azido-terminated glycidyl azide polymer (GAPA), its thermal decomposition characteristics was investigated through differential scanning calorimetry(DSC) and thermal gravimetry(TG). The apparent activation energy, pre-exponential factor and thermal decomposition kinetic equation were studied based on the DSC curve peak temperatures and the TG curve decomposition degrees at heating rates of 2 ℃·min^-1, 5 ℃·min^-1, 10 ℃·min^-1 and 20 ℃·min^-1. Its kinetic parameters thermodynamic and thermal safety parameters were calculated. The study indicates that there are two stages in the GAPA thermal decomposition reaction with the apparent activation energy E_K=218.47 kJ·mol^-1, pre-exponential factor A_K=1.06×10²²s^-1, self-ignition temperature T_bpo=506.55 K, self-accelerated decomposition temperature T_SADT=496.78 K, free energy of activation ΔG^≠=132.76 kJ·mol^-1, enthalpy of activation ΔH^≠=214.34 kJ·mol^-1 and entropy of activation ΔS^≠=164.21 J·mol^-1·K^-1.