Aiming at the operational characteristics of ground synthetic units and the shortcomings of traditional firepower distribution model, a firepower distribution model with minimum firepower waste is established. The model aims to roughly meet the damage requirements without excessively pursuing the absolute damage probability in order to avoid excessive concentration and waste of firepower. A model solving method based on improved genetic algorithm is proposed to enhance the ability of the algorithm to optimize the model. The simulation results and comparative analysis show that the model is reasonable and feasible, which can provide a better solution for the firepower optimization allocation of the ground synthesis unit.