Weapon-Target Assignment for attacking ground targets (BTG-WTA) is an important issue in modern warfare,which has larger scale and is more complicated than the ordinary weapon-target assignment.Particle Swarm Optimization (PSO) algorithm is used for solution of the BTG-WTA.The key issues,such as particle initialization and inertia weight selection,are improved for adaptable to BTG-WTA model,and simulation is made to an example.The results of simulated experiment indicate that PSO is more efficient than the classical algorithm for BTG-WTA,and thus has great application value.