A person's identity is shaped by one's life experiences. Aside from family, school forms the major backdrop of the everyday experiences of children and plays an important role in shaping identity. This paper examines education and the development of identity among school-age migrant children enrolled in Beijing's schools. Marginality is the theme running through this analysis. The marginalisation of migrant children in Beijing is defined and sanctioned by the outdated household registration system that excludes them from enrolling in public schools. Many attend segregated migrant children's schools. Even after the government has relaxed its rules to allow migrant children into the public system, they suffer discrimination based on their low social status and rural origin, each reinforcing the other. These experiences shape their sense of identity. They want to stay in Beijing but know they are not accepted. They call themselves as members of their home regions, but would have difficulty fitting into their home communities and have no intention of living there. This study helps us understand how school interactions shape the identity of migrant children not only in Beijing but of the estimated 20 million migrant children in China's other major urban centres albeit with some differences.