Social identity theory which offered new explanations to the group behavior has become the most influential theory in the field of intergroup relation.According to the theory,when an individual in a particular group fails to identify his group status and shows a sense of alienation,deprivation and inferiority,he will be inflicted by a social identity threat.In order to cope with the threat,the strategies for social identity management are intended to acquire positive social identity and enhance the esteem of individual and group through various effective methods.The studies on the complexities of social identity and strategies for social identity management can help promote the harmonious coexistence between different social groups in the period of social transformation,reduce the difficulties individuals have in acquiring their social identities,and enhance the integration and harmony between different social groups in China.