Abstract: Group identity is an important way for an individual to get his social identity.However，excluded for systematic and nonsystematic reasons，migrate workers are unable to establish a positive social identity，and thus suffered from a lack of self identity，self esteem and orientation，which result in a mental distance and opposition between them and urban community.By studying media influence on migrate workers′ identity with respect to social categorization，meaning of identity and self categorization，the author hopes to promote mass media awareness of their social function and responsibility.

Key words: social identity, mass media, migrate worker, self esteem, self identity 