目的了解2011年北京市西城区病媒生物种群密度变化、环境分布及季节消长变化,为今后病媒生物防制提供科学依据。方法成蚊密度监测采用CO2灯诱法;蝇密度监测采用笼诱法;鼠密度监测采用夹夜法和粉块法;蟑螂密度调查采用粘捕法。结果淡色库蚊密度最高,环境中公园绿地蚊密度最高,7月上旬和8月上旬出现2个峰值;麻蝇密度最高,环境中公园绿地蝇密度最高,5～7月共出现4个峰值;鼠种主要为小家鼠和褐家鼠,受春秋季灭鼠影响不呈季节性分布;蜚蠊全部是德国小蠊,受统一灭蟑的影响也不呈季节性分布。结论蚊、蝇密度与2010年相比有所增加,公园绿地仍为防制重点,鼠和蟑螂受防制工作的影响密度较低,环境分布不明显。早期开展重点地区防制应为今后工作重点。 Objective To understand the changes of population density, environmental distribution and seasonal fluctuation of vector organisms in Xicheng District of Beijing in 2011, and to provide a scientific basis for future vector control of vectors. Methods The density of adult mosquitoes was monitored by CO2 lamp. The density of flies was monitored by cage induction method. The night and night were used to monitor the density of mice. The density of cockroaches was measured by stick-catching method. The results showed that the population density of Culex pipiens pallens was the highest, with the highest mosquito density in the parks and parks in the environment. There were two peaks in the first ten days of July and the first ten days of August, the highest density of the flies, the highest density of green flies in the environment and four peaks from May to July. Species mainly Mus musculus and Rattus norvegicus, affected by the spring and autumn rodent infestation is not seasonal; cockroaches are all German cockroach, affected by the unified cockroach is not a seasonal distribution. Conclusions The density of mosquitoes and flies increased compared with that of 2010, and the park green space was still the key point for prevention and control. Rats and cockroaches were less affected by the control work and the environmental distribution was not obvious. Early prevention and control in key areas should be the focus of future work.