本文报道了1997年3月—1998年2月北海口岸蜚蠊种群密度及其季节消长的情况,本次调查共发现蜚蠊有2科3属6种,以美洲大蠊为优势种,占89.63％。全年均有蜚蠊活动,蜚蠊的月平均密度为0.96只/盒,以夏秋季较高,冬春季较低,7、8月份为高峰期。蜚蠊密度消长与气温的高低有密切的相关关系(r=0.858 tr=5.828 p<0.001) This paper reports the population density and seasonal fluctuation of cockroaches in the North Sea from March 1997 to February 1998. There are 6 species of 3 genera and 2 species of cockroach found in this investigation. The dominant species is American cockroach, accounting for 89.63 %. Cockroach activity throughout the year, cockroaches monthly average density of 0.96 / box, with a high summer and autumn, winter and spring is low, July and August as the peak. Cockroach density and temperature rise and decline are closely related (r = 0.858 tr = 5.828 p <0.001)