The burning rate and burning rate-pressure exponent of the double-based propellant were modified. The regularity of combustion performance was investigated by changing the content of catalyst Gal-BiCu, modification of the content and mixture ratio of plasticizers and adding some carbon black with different grain diameters. Results show that the burning rate of the green propellant can be modulated from 13.92 mm·s^-1 to 25.77 mm·s^-1 at 10 MPa and its burning rate-pressure exponent is around 0.2. While the platform is largly extended within 8-22 MPa by adding carbon black.