By using the target-line method,the effects of solid content,aluminum content, ammonium dinitramide (ADN) content and particle size, burning rate catalyst and heat stabilizer on the combustion properties of PGN/ADN propellants were studied during the pressure from 3.0 MPa to 15.0 MPa. Results show that the burning rate of PGN/ADN propellants increases from 9.63 mm?s-1 to 26.71 mm?s-1, of which the pressure exponent increases from 0.49 to 1.05 when the diameter of ADN increases from less than 450 μm to 450-900 μm. On the other hand, the burning rate increases from 4.83 mm?s-1 to 12.18 mm?s-1, and the pressure exponent increases from 0.11 to 0.61 when the content of ADN increases from 0 to 30%. Aluminum had little effect on buring rate and pressure exponent. Burning rate increases 16.1% by adding Fe₂O₃ with 0.5% content. The pressure exponent drops to 0.22 by adding oxamide (OXM) with the same content as Fe2O3; simultaneously, the pressure exponent drops differently to 0.34 and 0.40 by adding 1% 2-nitrodiphenylamine (2-DNPA) and 1% N-methyl-4-nitroaniline (MNA) stabilizer separately.