The influences of combustion catalysts(Pb salt, Pb salt/Cu salt, and Pb salt/Cu salt/Carbon black), combustion stabilizers(CaCO₃、TiO₂、MgO and Al₂O₃) and particle size of RDX powder(7μm、21μm and 45μm) on the low pressure(1～5MPa) combustion properties of RDX-CMDB propellant were studied by means of burning rate test. The results show that the burning rate increases and pressure index decreases of propellant by the addition of Pb salt/Cu salt/Carbon black combustion catalysts and CaCO₃, the burning rate increases of propellant with the increase of particle size of RDX powder, and the burning rate decreases of propellant by the addition of TiO₂、MgO and Al₂O₃.