The community structure and seasonal dynamic of birds at 5 habitat in Erenhot of Inner Mongolia were investigated from May in 2010 to April in 2011. A total of 124 bird species were recorded along the belt transect and at fixed-radius point. The bird species belong to 15 orders, 34 families, of them 19 birds are residents, 72 summer visitors, 29 passing migrants and 4 winter visitors. Among the birds bred here, 82 species belong to Palaearctic realm, 9 species of Oriental realm. Totally 13 species are characteristically as the Central Asian type, that indicated the main characteristics of the avifauna geographic type in the study area. The bird community was greatly different between the 5 habitats, the highest and lowest diversity index of bird occurred in woodland and in residential area, respectively. The bird species component was difference between seasons, the species numbers of bird in spring was highest in spring and lowest in winter.