In order torealize the pressure platform effect in the process of gun firing, based on theidea of traveling charge, the interior ballistic model of solid traveling chargeand the model of simulated annealing algorithm were established. Consideringtwo key parameters, ignition delay and traveling propellant burning rate, the optimizationdesign was carried out. The results show that the optimization results of thesimulated annealing algorithm are better than the experimental results, and theinitial velocity can increase 100m/s by improving the fullness coefficient ofchamber pressure under the same maximum pressure.