[目的]了解麻疹暴发的原因,探讨控制措施。[方法]对2010年3~4月威海市钦村小学1起麻疹暴发疫情进行调查。[结果]3月25日至4月18日该校共发生麻疹病例4例,患者均为流动儿童,流动儿童罹患率为0.55%(4/728)。[结论]未接种麻疹疫苗是本次麻疹暴发的原因,应提高流动儿童麻疹疫苗接种率。 [Objective] To understand the causes of measles outbreak and discuss control measures. [Method] A survey was conducted on 1 outbreak of measles in Qincun Primary School, Weihai City from March to April in 2010. [Results] From March 25 to April 18, a total of 4 measles cases occurred in this school, all of whom were migrant children. The prevalence of migrant children was 0.55% (4/728). [Conclusion] The unvaccinated measles vaccine is the cause of the measles outbreak and should increase the vaccination rate of migrant children measles.