A bionic network nanostructure of zinc oxide (ZnO) similar to Morpho butterfly wing, was fabricated by a vapor transport method. Its morphology was characterized by X-ray diffraction, scanning electronic microscope and its backward scattering characteristics was investigated. The backward scattering patterns of the sample, giving the exhibition of wavelength-selected and angle-dependent characteristics, similar to the optical effect of morpho butterfly wing, were observed. The mechanism of this optical function was discussed based on finite difference time-domain and rigorous coupled-wave analysis method. The result showed that the sample′s periodic surface results in the optical effect.