By analyzing the current situation of the weapon equipment maintenance at home and abroad, 3D printing technology was proposed to realize the rapid maintenance of military components. Through the dual topology optimization of structure and material, the composite parts were formed in one by using 3D printing technology, which saves the assembly link, saves the cost and time, and achieves the lightweight effect. Combined with the requirements of battlefield emergency repair and the characteristics of 3D printing technology, a new idea was provided for the application of 3D printing technology in the maintenance of the weapon equipment