Abstract: Avian biodiversity is one of the most important components of biodiversity. The population dynamics of birds change following climate and ecology. Kongtong Mountain in Gansu Province is close to the west of Qinling Mountains, which is known to divide the zoogeographic fauna of birds into north and south. Long-term bird diversity monitoring in this area is vital for understanding the trend of species dispersal under climate change in the north. The population and distribution of birds in this area were investigated by using line transect method in late April and late May in 2016, 2017 and 2018 respectively. The Shannon-Wiener diversity index, Simpson diversity index, Pielou evenness index, and Berger-Parker dominance index were calculated in Excel 2013. A Chord Diagram of bird dominance with different habitats in R 3.5.3 was also made. The results show that: (1)108 bird species were recorded (82 in 2016, 78 in 2017 and 85 in 2018). (2) The diversity index and evenness index of bird community were the highest in deciduous broad-leaved forest habitat, and the lowest in rural habitat. (3) Regarding the composition of birds fauna, 73 species belong to cosmopolitan species (67.59%), 23 Palaearctic realm species (21.30%) and 10 Oriental realm species (9.26%). The summer avifauna in Kongtong Mountain differs from the surrounding areas. Meanwhile, the composition of bird species in this zone had no significant change across years.