In order to understand the effect of nanometer nickel(nano-Ni) on the over-all performances of Al-composite modified double base propellant(CMDB) and hexogen(RDX)/Al-CMDB propellants, the energetic property, thermal stability, mechanical sensitivity, mechanical performances, inner ballistic properties and the dependence of burn rate on the aging process have been studied. The results show that the addition of nano-Ni had little effect on the performances. The effects of nano-Ni on combustion behavior of these propellants have also been studied. The results show that nano-Ni can greatly improve the combustion performances. The inclusion of nano-Ni can increase the burn rate of Al-CMDB propellant from 28.32 mm·s^-1 to 35.94 mm·s^-1 at 9.81 MPa, and lowering the pressure exponent(n) between 12-22 MPa from 0.26 to 0.12. The burn rate of RDX/Al-CMDB containing nano-Ni at 9.81 MPa can reach 36.63 mm·s^-1, with negative n between 16-22 MPa at different initial temperature. The specific impulse of RDX/Al-CMDB propellant could reach 241.1 s at -40 ℃ and 246.9 s at 50 ℃ in Φ130 mm rocket motor.