Nowadays Engineering Industry is searching for new materials and manufacturing techniques to reduce weight and improve parts’ mechanical characteristics. In this scenario, Additive Manufacturing represents a central role. This technique differs from the traditional one because a part is realized by overlapping layer by layer, adding material only where necessary. This feature permits the creation of reticulated structures called lattice. Considering a structural analysis of lattice parts using FEM software requires many calculations power, and time, consequently elevating costs. These aspects are limitations in lattice structure applications. The thesis work focuses on defining a methodology helpful for simplifying and speeding the structural analysis of lattice structure.