【Objective】 To study the state of the health knowledge, attitudes and behavior of floating children in Beijing, and accomplish the needs of health education assessment in migrant children schools, to provide a theoretical basis and recommendations in order to complete the implementation of school health education. 【Methods】 Self-report questionnaire was used and laid emphasis on anonymous, totally 730 fourth to sixth grade students of 5 migrant children schools in two districts of Beijing were included. 【Results】 There existenced sex and grade differences in knowledge of the overall health of floating children; Habits in terms of health behavior, they lacked of the hygiene of food(24.11% could not eat breakfast everyday, 20.99% could not eat vegetables frequently), hand washing, oral (37.43% could not tooth brushing before sleep), etc. And obviously 93.88% needed the health education. 【Conclusions】 In order to improve the floating children's health, and develop the health awareness, strengthen the implementation and management of health education should be done by the migrant children school.