本文报告了１９９４年１２月至１９９５年１１月某军港蝇类构成、分布和季节消长规律。捕蝇１３４４４只，共分为４科２７属５０种，其中黑斑海花蝇为该地区首次发现。蝇类平均密度为３１．１２只／笼·日。蝇类活动高峰在７月与９月份。蝇类季节消长与气象条件的变化密切相关。蝇类分布与孳生场所有密切关系。此次调查结果为今后港内防制蝇类提供了科学依据。 This article reports the formation, distribution and seasonal fluctuation of flies in a military port from December 1994 to November 1995. There were 13444 fly-trap flies, which were divided into 4 families, 27 genera and 50 species. Among them, the black-spot flies were found for the first time in the area. Flies average density of 31.12 / cage day. Flies peaked in July and September. The seasonal fluctuation of flies is closely related to the change of meteorological conditions. Flies distribution and breeding places are closely related. The findings provide a scientific basis for the future control of flies in Hong Kong.