Abstract: In order to develop the light-weight biological composite structures, the fore wing structures of beetles, Allomyrina dichotoma, were investigated. As a result, the structural models for both fore-wing of the beetle and trabecular structure were established: (1) the allomyrina dichotoma fore-wing is of sandwich plate structure with the central void layer of trabeculae, and this is one of the typical light-weight composite structures; (2) chitin fibers in trabeculae curved more than 90 degree to connect to the chitin fiber on the upper and the lower lamination, and it is clear that this structure will increase peeling resistance greatly for the laminated composite structures.