【Objective】 To investigate the anemia status and other impact factors of migrant children under 5. 【Methods】 The content of haemoglobin was measured by cyanmethemoglobin, the diagnostic criterion was 110 g/L. The relationship were analysed between anemia and other factors with questionnaires for 490 migrant children under 5 cluster sampled from Chaoyang district. 【Results】 The prevalence of anemia for migrant children under 5 was 5.71％, and the prevalence under 1 was 14.77%. With univariate analyses, smaller age, low birth weight, non-complementary food feeding and non EBF under 6 months were increase the risk of anemia. While, low birth weight, non-complementary food feeding, diarrhea and pulmonary disorder during the last two weeks and EBF were the impact factors for children anemia with multivariate analyses. 【Conclusion】 The necessary actions should be taken for migrant children to improve their nutrition and health status.