Abstract: Research on damage characteristics of composite grid structures for unmanned aircraft wing under low velocity impact was presented in this paper. The composite grid structures were modeled in finite element analysis software ABAQUS. Then simulation analysis, in which the model was subjected to low velocity impact with the assumption of no penetration, was carried out by employing Hashin-Rotem strain failure criteria and Camanho Parameter degradation mode under different conditions, such as different grid shapes, different impact locations, different impact energies, et al. Simulation results show that the damage characteristics vary greatly with different impact locations, such as damage types, damage areas, damage propagation directions, et al. It also proves that grid structures have significantly resistance performances to damage propagation and failures.