Abstract: Crossborder ethnic groups refers to the same minorities, who resides closely to the border and be separated in different countries because of the long history development. The problem of Cross-border ethnic groupsis so important for Chinese border stability and social harmony, so it is value to research the ethnic identification problem with strategy sense. Thisarticle bases on the concept of cross-border ethnic, analyzes the scope and influence factors of cross-border ethnic identities indepth, seeks to furtherstrengthen the identities ways and methods of cross-border ethnic.