Graffiti is a kind of sub-cultural landscape in urban public places, and it is also a social symbol with anti-language characteristics. The social and cultural meanings conveyed by graffiti are increasingly attracting the attention of experts and scholars in the related field. Based on the attributes and characteristics of graffiti in the previous research, the preliminary ideas of graffiti interface studies are put forward. The findings show that graffiti phenomenon has the dual attributes of X-Scape (atypical linguistic landscape) and marginal discourse, and has the distinctive characteristics of temporariness, transgression, parasitism, and multi-modality. interdisciplinary perspectives are helpful to describe and analyze graffiti phenomenon, and theoretical perspectives include social identity, critical discourse analysis, urban politics, place semiotics and dialogism. This study will help to reveal the implicit meaning of language use in public places, and the aforementioned research outcomes can broaden the horizon and diversify the approach on the studies of graffiti phenomenon.