The surface morphology of the membranous wing of the oriental mole cricket (Gryllotalpa orientalis Burmeister) was examined by scanning electron microscopy (SEM). The contact angles of water on the membranous wing surface of the oriental mole cricket were determined with an interface tension/wetting-angle measuring instrument (model OCA20). The relationship between wettability of the membranous wing surface of the oriental mole cricket with geometrical structure of its membranous wing surface was analyzed. The results showed the difference of each part of the membranous wing surface in the geometrical structure. The average apparent contact angles of water on the membranous wing surface of the oriental mole cricket was from 94.4° to 118.6°, indicating a hydrophobic ability. The comprehensive action of the geometrically structural surface and the hydrophobic function was the dominant mechanism of preventing adhesion of soil and water from their membranous wing surface. This research established the theoretical foundation on exploring all kinds of membranous wings and improving the waterproofness of green thin film.