Objective To investigate the common species, densities and seasonal fluctuation of flies in human settlements and surroundings in Henan province, China, in 2020, and to provide a basis for scientific prevention and control. Methods The data of flies captured by the cage trapping method were collected from fly surveillance in Henan province, from April to October in 2020. Descriptive methods were used for statistical analysis. Residential areas, catering environment, greenbelts, and farm product markets were chosen for the investigation. Results In 2020, the total density of flies in Henan province was 8.39 flies/cage, and the dominant species were Musca domestica (41.49%), Muscina stabulans (19.26%) and Sarcophagidae (11.00%). The highest density of flies was found in farm product market (10.43 flies/cage). The seasonal fluctuation of the total density of flies showed a unimodal distribution and reached the peak in June. Among the dominant fly species, M. domestica, M. stabulans, and Sarcophagidae had the similar seasonal fluctuation trends to the total density of flies. Conclusion According to the composition and seasonal fluctuation of flies in human settlements and surroundings in Henan province, it is suggested that reasonable prevention and control measures should be taken according to the surveillance results in the districts or counties at each surveillance site to reduce fly infestation and fly-borne diseases.
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