A promising HTPB propellant formulation is presented in this paper。 Itsburning rate can be regulated from 25 to 30mm/s and the specific impulse is greater than2354N· s/kg,pressure exponent n<0.4.Furthermore,the processability(slurry 5h 50<700Pa·s)and mechanical strength(25℃, σ_m=1.0MPa,-40℃,ε_m>30%)are satisfactory to practical requirements.