Sensitivities of FOX-7(RDX)and HTPB propellants with FOX-7(RDX ) were studied by means of DSC-TG,sensitivity test apparatus. Results show that the apparent activation energy of FOX-7 is 245.2 kJ·mol^-1 and the major exothermic DSC peak temperature is 222.13 ℃,and friction sensitivity is less than 68% while impact sensitivity is over 25.0 J. Compared with RDX formulations,mechanical sensitivities and electrostatic discharges of HTPB propellants with FOX-7 reduce remarkably. When the content of FOX-7 is 15% in HTPB/AP propellants,the violent decomposition of AP is weakened evidently and the major exothermic DSC peak is about 260 ℃ which is 40 ℃ lower than that of RDX/HTPB formulations.