Abstract: In order to understand the community structure and geographical character of butterfly in middle section of Daxing'anling Mountains, the diversity of butterfly in Wuchagou area in five habitats (mountain meadow, mountain deciduous broad-leaved forest, swamp meadow, farmland and mountain coniferous forest) was investigated in July-August, 2019. The results show that 5 families, 44 genera, 65 species, 856 individuals were recorded. The dominant family was Nymphalidae. Lycaenidae and Pieridae were common groups, and Hesperiidae and Papilionidae were rare groups. The dominant species were Leptidea amurensis, Aphantopus hyperantus, Argynnis paphia, Fabriciana adippe and Minois dryas. Analysis of butterfly diversity in different habitat types showed the mountain meadow with highest diversity index (3.115 2) and evenness index (0.898 8), the mountain deciduous broad-leaved forest with the highest abundance index (6.838 6), and the farmland with the highest dominance index (0.089 2). The similarity analysis of five habitats show that the coefficients between different habitats were 0.25-0.50, for medium dissimilarity. The results of the fauna analysis show the dominant of Palaeartic-Oriental common species. As for Chinese Fauna, there were 65 species (100%) recorded in Mongolia-Xinjiang region, followed by Northeast region with 62 species (95.38%). As for the Inner Mongolian fauna, there were 65 species (100%) recorded in Daxing'anling Mountain sub-region, followed by Inner Mogolian Plateau subregion with 57 species (87.69%). These community structure and geographical characters of butterfly is closely related to the geographical location of Wuchagou area.

Key words: butterfly, diversity, community composition, habitat, fauna