Cross-ethnic friendship is regarded as a positive way of communication that promotes theidentity of the ethnic community by improving the attitude of inter-ethnic interaction and enhancingthe positivity of inter-ethnic contact to realize the goal of enhancing the sense of community of theChinese nation. Currently, the study of cross-ethnic friendship is still in its infancy. Based on a largeamount of domestic and international literature, this thesis analyzes the research direction, researchperspectives, and problems in the study of trans-ethnic friendship from the conceptual definition of transethnicfriendship at the current stage and puts forward the prospect of future research to promote thedevelopment of trans-ethnic friendship research in a deeper and wider field.