【Objective】 To understand the situation of unintentional injuries among migrant children under six years old in Beijing and provide basis for future intervention. 【Methods】 Four migrant communities in Beijing were randomly selected to participate in the study. Questionnaire survey was conducted among parents of migrant children under six years old. Parents of resident children were also interviewed as the control group. The contents of the questionnaire survey included unintentional injuries related knowledge and behavior, occurrence of unintentional injuries in the previous year. 【Results】 The general incidences of unintentional injuries among migrant and resident children were 11.9% and 12.9% respectively. There was no statistically significant difference between the two groups(χ²＝0.119,P=0.730). The incidences of road traffic injuries, sharp instrument injuries, burns and bites were higher among migrant children than resident children. 40.5% of injuries among migrant children happened at home, 26.2% at outside activity spots, 33.3% at road sides or other outside places. 92.3% of injuries among resident children happened at home. The average time of hospital admission, rest time and medical cost due to injuries among migrant children were significant higher than those of the resident children. 【Conclusions】 There are specific epidemiological characters on unintentional injuries among migrant children under six years old in Beijing. The disease burden of unintentional injuries among migrant children is higher than resident children. Intervention methods should be taken to decrease the incidence and burden of unintentional injuries among migrant children.