The influence factors on the burning rate characteristics of GAP/AN propellants including binder,plasticizing ratio,AN content,particle size of AN,content of AP,HMX and Al were studied. The experimental results indicate that plasticizing ratio and AN content show a strong effect on the burning rate characteristics of GAP/AN propellants. Lowered the plasticizing ratio and AN content,the higher burning rate and lower burning rate pressure exponent were achieved.