Objective To investigate the species composition of rodents and their external parasitic fleas in Dandong area.Methods Rodents were captured by cage-night method,and the fleas were collected from the rodents.The species of rodents and their external parasitic fleas were classified and identified.Results A total of 449 rodents belonging to 3 families 7 genera 8 species were captured from Dandong area,and Rattus norvegicus(36.53%)and Apodemus agrarius(28.29%)were the dominant species.The composition of rodents in different habitats was different.485 fleas collected belonged to 10 species,9 genera,4 families,and Neopsylla bidentatiformis(31.34%)and Ctenophthalmus congeneroides congeneroides(25.77%)were the dominant species.The species composition of external parasitic fleas in different rodents was different.Conclusion The survey provides a scientific basis for further research and control of rodents and their transmitted diseases in Dandong area.