The thermal properties of polymer bonded HMX/TATB are studied by using DSC and critical temperature determination,and the influence of additives on HMX′s thermal-sensitivity,such as TATB,binder,Al powder and wax is discussed as well. The results indicate that TATB alone gives only one exothermic peak whereas TATB containing 5% binder two exothermic peak. When HMX content is over 40%，the DSC exothermic peak temperature of polymer bonded HMX/TATB approaches to that of HMX. The content of TATB in formulation obviously affects the critical temperature (T_cr) of thermal explosion in 1 000 s. When TATB content is about 80%，T_cr increases greatly.