The contact angles of distilled water and methanol solution on the wings of butterflies were determined by a visual contact angle measuring system.The scale structures of the wings were observed using scanning electron microscopy,The influence of the scale micro-and ultra-structure on the wettability was investigated.Results show that the contact angle of distilled water on the wing surfaces varies from 134.0° to 159.2°.High hydrophobicity is found in six species with contact angles greater than 150°.The wing surfaces of some species are not only hydrophobic but also resist the wetting by methanol solution with 55% concentration.Only two species in Parnassius can not resist the wetting because the micro-structure(spindle-like shape) and ultra-structure(pinnule-like shape) of the wing scales are remarkably different from that of other species.The concentration of methanol solution for the occurrence of spreading/wetting on the wing surfaces of different species varies from 70% to 95%.After wetting by methanol solution for 10 min,the distilled water contact angle on the wing surface increases by 0.8°-2.1°,showing the promotion of capacity against wetting by distilled water. The contact angles of distilled water and methanol solution on the wings of butterflies were determined by a visual contact angle measuring system. The scale structures of the wings were observed using scanning electron microscopy, The influence of the scale micro-and ultra-structure on the Results show that the contact angle of distilled water on the wing surfaces varies from 134.0 ° to 159.2 °. High hydrophobicity is found in six species with contact angles greater than 150 °. The wing surfaces of some species are not only hydrophobic but also resist the wetting by methanol solution with 55% concentration. Ofly two species in Parnassius can not resist the wetting because the micro-structure (spindle-like shape) and ultra-structure (pinnule-like shape) of the wing scales are remarkably different from that of other species. concentration of methanol solution for the occurrence of spreading / wetting on the wing surfaces of different species varies from 70% to 95% .After wetting by methanol solution for 10 min, the distilled water contact angle on the wing surface increases by 0.8 ° -2.1 °, showing the promotion of capacity against wetting by distilled water.