近年来 ,随着改革开放的逐步深入和市场经济的日益发展 ,流动人口与日俱增 ,流动儿童也急剧增多。由于流动儿童居无定所 ,难以管理 ,常常不能得到及时的免疫接种 ,从而影响了计划免疫工作的正常开展。为了解盐都县境内 0～ 4岁流动儿童的计划免疫接种现况 ,以便制订相应的对策 In recent years, with the gradual deepening of the reform and opening up and the growing market economy, the floating population has been steadily increasing and the number of migrant children has also risen sharply. Since migrant children are unsustainable and unmanageable, they often can not get timely immunization, thus affecting the normal development of planned immunization work. In order to understand the current situation of planned immunization of migrant children aged 0 ~ 4 in Yandu County in order to formulate corresponding measures