In recent years, a large number of Chinese students have gone overseas to study, and the issueof how social media affects the integration of this cross-cultural mobile group into the new social andcultural environment is worthy of in-depth discussion. Different from the existing studies that focuson the impact of a single social media platform on the social integration of international students, thisstudy starts from the background of the polymedia era to investigate the distributive use strategies andcross-cultural adaptation of Chinese international students to different social media. Based on in-depthinterviews with 14 Chinese overseas students, this study finds that there is a distribution imbalancein the use of social media by Chinese overseas students. In the interaction of transnational socialnetworks, international students develop integration strategies that are relatively alienated from thedestination society after reflection on themselves and foreign cultures and negative adjustment to socialmedia use strategies. Media differences and cultural divisions form multiple boundaries, making itdifficult for international students to form a diverse cultural identity. This study believes that cyberspacestrengthens the identity within ethnic groups, aggravates the conflicts in cross-cultural communication,and brings new challenges to the social integration of cross-cultural mobile groups.