This paper explores the establishment of migrant identities through linguistic and sociolinguistic exchanges in a Beijing public school. Drawing on the data from ethnographic observation and interviews, the research demonstrates how small features of language become emblematic of individual and group identities, and how such identities have an impact on the appraisal of migrant pupils’ performance at school as well as in wider frames of macro-political order which often invoke homogeneism within the dominant language ideologies, emphasizing linguistic uniformity and homogeneity.