Abstract: Processing Sophora japonica waste into solid fuel can effectively promote the efficient utilization of resources. Response surface methodology（RSM）is used to study the relationship between three physical properties of the density,durability and impact resistance of the formed fuel and temperature,moisture content and pressure,and the desirability functions is used to carry out three response optimization analysis of process parameters. The results show that in the range of temperature 50-130 ℃,moisture content 5%-13% and pressure 60-130 MPa,the solid fuel density,durability and impact resistance reached more than 0.994 g/cm~3,96.31% and 99.41%,respectively. The optimum process parameter combination are temperature 84.40 ℃,moisture content 5.08% and pressure 129.76 MPa,and the fuel density,durability and impact resistance are 1.075 g/cm~3,99.06% and 99.95%,respectively.