This study was to analyse on the bird communities of Deogyusan National Park conducted from July 2008 to June 2009, and from April to July, 2010. During the research period, a total of 2,689 individuals were observed, specifically, 12 orders, 34 families and 96 species. The most dominant species was Passer montanus (404 individuals, 15.02%), followed by Paradoxornis webbianus (156 individuals, 5.80%), Emberiza elegans (153 individuals, 5.69%), Corvus frugilegus (145 individuals, 5.39%), Hypsipetes amaurotis (110 individuals, 4.09%), Streptopelia orientalis (106 individuals, 3.94%), Aegithalos caudatus (97 individuals, 3.61%), Cettia diphone (94 individuals, 3.50%), and Turdus pallidus (89 individuals, 3.31%). The largest number of species were observed in May and June, breeding season, and in winter the number was low. The largest number of individuals were also observed in May and June, and the number was also low in fall and early spring. Species diversity was the highest in Baekryunsa area, forest area. Species richness was the highest in Seolcheon area, lowland snow area. Both species diversity and species richness were the lowest in Hyangjeokbong area, mountain ridge. The coefficient of similarity of research areas shows that species composition is dependent on environment. Areas were groups into Hyangjeokbong area (highland ridge), Baekryunsa area and Anseong area (slope and valley), and lowland area and Seolcheon area (farmland and stream).