The helmet is inspired by 3D Voronoi structure which is widely distributed in Nature, for example, the structure of the animal's bone, turtle shell, and even straw, etc. The structure gives the organism perfect physical performance in aspects of lightness, stability and energy interaction. Thus, we apply this parametric technique into the improvement of helmet design. With a combination of parametric technique and bionics, the helmet has an excellent external mechanical system. Its porous characteristic achieves balance of safety, lightness, better air permeability, and organic cool appearance