Abstract: The key bird species to be guarded against in the airport are the main bird-strike-causing species. It is of great significance to scientifically evaluate the bird-strike risks of different birds for the prevention of bird strikes in airport. In this study, the birds at Nanchong Gaoping Airport were investigated by the transect method and net capture method in 2021. A total of 60 species of birds were recorded, belonging to 33 families, 15 orders. The results showed that compared with 21 species in 2007, 25 species of key birds were found in 2021, among which 10 new species were increased and 6 species were lost. 15 species of birds, such as Columba livia and Hirundo rustica, had the same evaluation results. The main factors influencing the changes of bird species mainly include: the changes of ecological environment, the effective implementation of bird strike prevention at the airport and the enhancement of bird protection awareness. In combination with the biological characteristics of birds and the ecological environment around the airport, the suggestions on reducing the flowering and fruiting of plants in the flight area, controlling the grass height, killing insects and cleaning up the stagnant water environment were put forward for the airport, and some specific preventive measures were proposed for key bird species.