目的了解2014年北京市西城区蚊蝇种群密度变化、环境分布以及季节消长情况,为蚊蝇防治提供参考。方法蚊密度监测采用CO2诱蚊灯法;蝇密度监测采用笼诱法。结果 2014年蚊密度为0.396只/(灯·h),高峰出现在8月上旬,全年淡色库蚊密度最高,环境中旅游景点蚊密度最高;蝇密度为5.96只/笼,在6月上旬和8月上旬出现两个峰值,全年麻蝇密度最高,环境中公园绿地蝇密度最高。结论蚊密度较过去3年有所降低,蝇密度较过去3年略有增加,持续开展监测工作,早期进行蚊蝇防治为今后工作重点。 Objective To understand the changes of population density, environmental distribution and seasonal fluctuation of mosquitoes and flies in Xicheng District of Beijing in 2014, and provide references for the prevention and control of mosquitoes and flies. Methods Mosquito density monitoring using CO2 lamp; fly density monitoring cage induction method. Results The mosquito density was 0.396 / (lamp · h) in 2014, and the peak appeared in early August. The density of Culex pipiens pallens was the highest in the whole year, and mosquito density was highest in the tourist attractions in the environment. The density of flies was 5.96 / cage. In early June And two peaks appeared in early August, the highest density of flies in the whole year and the highest density of green flies in the environment. Conclusion The density of mosquitoes has been reduced over the past three years. The density of flies has slightly increased over the past three years. Monitoring work continues to be carried out continuously and early prevention and control of mosquitoes and flies are the focus of future work.