Drawing on the notions of scale and space, this paper investigates identity construction among a group of mainland Chinese cross-boundary students by analysing their language choices and linguistic practices in a multilingual university in Hong Kong. The research illustrates how movement across spaces by these students produces varying index values for languages and influences their language usage, which becomes emblematic of individual and group identities. The research demonstrates that the values developed in their place of origin may have influences on their identity construction and peer communication in the host context. Finally, it shows that these students use their multiple linguistic repertoires to project multilayered identities and gain legitimacy in peer interactions. (Contains 1 note.)