The study is based on Youth Project supported by the National Social Science Fund of China named “Research on Public Opinion Construction of National Identity in Social Media”. In order to delineate the behavioral characteristics of social media users，this article analyzes the differentiation of media preference and credibility cognition of information channels based on 2566 questionnaires collected in June 2020. The study illuminates that TV is still the main channel that influences the mobile phone users’ media access. Meanwhile the diversity of social media channels builds a complex ecology of media access. Specially，the channel of political news is occupied by CCTV，Weibo and traditional portals，and the channel credibility is held by the central traditional media，government websites and traditional portals.